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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, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current:
Federal									$ 11,853	$ 5,107	$ 11,301
State									400	457	463
Total									12,253	5,564	11,764
Deferred:
Federal									(121)	5,318	17
Income tax expense	$ 3,560	$ 2,952	$ 2,952	$ 2,668	$ 1,904	$ 2,992	$ 2,894	$ 3,092	$ 12,132	$ 10,882	$ 11,781

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.