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Income Taxes (Schedule of Income Tax Expense) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
Federal									$ 11,435us-gaap_CurrentFederalTaxExpenseBenefit	$ 11,853us-gaap_CurrentFederalTaxExpenseBenefit	$ 5,107us-gaap_CurrentFederalTaxExpenseBenefit
State									505	400	457
Total									11,940us-gaap_CurrentIncomeTaxExpenseBenefit	12,253us-gaap_CurrentIncomeTaxExpenseBenefit	5,564us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:
Federal									(500)	(121)	5,318
Income tax expense	$ 2,523us-gaap_IncomeTaxExpenseBenefit	$ 3,154us-gaap_IncomeTaxExpenseBenefit	$ 3,001us-gaap_IncomeTaxExpenseBenefit	$ 2,762us-gaap_IncomeTaxExpenseBenefit	$ 3,560us-gaap_IncomeTaxExpenseBenefit	$ 2,952us-gaap_IncomeTaxExpenseBenefit	$ 2,952us-gaap_IncomeTaxExpenseBenefit	$ 2,668us-gaap_IncomeTaxExpenseBenefit	$ 11,440us-gaap_IncomeTaxExpenseBenefit	$ 12,132us-gaap_IncomeTaxExpenseBenefit	$ 10,882us-gaap_IncomeTaxExpenseBenefit

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

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

Amount of current state and local 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.