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Income Taxes (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Line Items]
Current	$ 32,295us-gaap_CurrentIncomeTaxExpenseBenefit	$ 31,610us-gaap_CurrentIncomeTaxExpenseBenefit	$ 26,331us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred	9,575us-gaap_DeferredIncomeTaxExpenseBenefit	11,563us-gaap_DeferredIncomeTaxExpenseBenefit	18,976us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax expense provided on income	$ 41,870us-gaap_IncomeTaxExpenseBenefit	$ 43,173us-gaap_IncomeTaxExpenseBenefit	$ 45,307us-gaap_IncomeTaxExpenseBenefit

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.