Annual report pursuant to Section 13 and 15(d)

INCOME TAXES - Schedule of Income Tax Reconciliation (Details)

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INCOME TAXES - Schedule of Income Tax Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]      
Expected taxes at current federal statutory income tax rate $ 66,312 $ 72,946 $ 62,185
State income taxes, net of federal tax benefit 5,764 7,271 7,967
Change in valuation allowance 0 0 (8,666)
Manufacturing deduction (5,917) (6,499) (4,910)
Federal tax credits (6,172) (7,835) (3,614)
Non-deductible costs and other 739 293 246
Income tax expense $ 60,726 $ 66,176 $ 53,208