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Income Taxes - Components of the Provision for Federal and State Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Currently payable
Federal	$ 27,039us-gaap_CurrentFederalTaxExpenseBenefit	$ 27,587us-gaap_CurrentFederalTaxExpenseBenefit	$ 12,984us-gaap_CurrentFederalTaxExpenseBenefit
Deferred
Federal	1,563	(2,456)	12,717
Total	$ 28,602us-gaap_IncomeTaxExpenseBenefit	$ 25,131us-gaap_IncomeTaxExpenseBenefit	$ 25,701us-gaap_IncomeTaxExpenseBenefit

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

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