Income Taxes Income Tax Expense Detail (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Abstract]
Current Federal Tax Expense (Benefit)	$ 20,460	$ 40,165	$ 14,369
Current State and Local Tax Expense (Benefit)	2,195	(1,068)	(4,653)
Current Income Tax Expense (Benefit)	22,655	39,097	9,716
Deferred Federal Income Tax Expense (Benefit)	16,587	(7,804)	14,321
Deferred State and Local Income Tax Expense (Benefit)	(1,844)	(636)	316
Deferred Income Tax Expense (Benefit)	14,743	(8,440)	14,637
Income Tax Expense (Benefit)	$ 37,398	$ 30,657	$ 24,353