Quarterly report pursuant to Section 13 or 15(d)

Stock Based and Deferred Compensation (Details 1)

v2.4.1.9
Stock Based and Deferred Compensation (Details 1) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Summary of stock based compensation agreements    
Unrecognized stock-based compensation cost $ 31,410us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized $ 20,577us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Weighted average years expense recognition period 2 years 10 months 28 days 2 years 1 month 10 days
Total equity awards outstanding 1,203,218mth_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesOutstanding [1] 1,255,714mth_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesOutstanding [1]
[1] Includes options outstanding and unvested restricted stock and performance-based awards and restricted stock units.