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Income Taxes (Details 1) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract] | |||
| Expected taxes at current federal statutory income tax rate | $ 72,946us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ 62,185us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ 10,099us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate |
| State income taxes, net of federal tax benefit | 7,271us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 7,967us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 1,878us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes |
| Change in valuation allowance | 0us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | (8,666)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | (85,460)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance |
| Change in state effective tax rate | 0mth_ChangeInStateEffectiveTaxRate | 0mth_ChangeInStateEffectiveTaxRate | (788)mth_ChangeInStateEffectiveTaxRate |
| Manufacturing deduction | (6,499)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities | (4,910)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities | 0us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities |
| Federal tax credits | (7,835)us-gaap_IncomeTaxReconciliationTaxCredits | (3,614)us-gaap_IncomeTaxReconciliationTaxCredits | (2,064)us-gaap_IncomeTaxReconciliationTaxCredits |
| Net interest adjustments | 0mth_IncomeTaxReconciliationNetInterestAdjustments | 0mth_IncomeTaxReconciliationNetInterestAdjustments | (589)mth_IncomeTaxReconciliationNetInterestAdjustments |
| Non-deductible costs and other | 293us-gaap_IncomeTaxReconciliationOtherReconcilingItems | 246us-gaap_IncomeTaxReconciliationOtherReconcilingItems | 615us-gaap_IncomeTaxReconciliationOtherReconcilingItems |
| Income tax expense/(benefit) | $ 66,176us-gaap_IncomeTaxExpenseBenefit | $ 53,208us-gaap_IncomeTaxExpenseBenefit | $ (76,309)us-gaap_IncomeTaxExpenseBenefit |
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- Definition
The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit that is attributable to changes in the income tax laws or rates (Monetary). No definition available.
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- Definition
Income Tax Reconciliation, Net Interest Adjustments No definition available.
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- Definition
Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of the difference between reported income tax expense (benefit) and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for qualified production activity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority noncontrolling interest income (loss), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, increase (decrease) in enacted tax rate, prior year income taxes, increase (decrease) in deferred tax asset valuation allowance, and other adjustments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state and local income tax expense (benefit). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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