Income Taxes Provision (benefit) for income taxes (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Abstract]
Current Federal Income Tax Expense	$ 13,200,000	$ 6,200,000	$ 28,800,000
Current State and Foreign Tax Expense (Benefit)	2,800,000	(600,000)	4,200,000
Current Income Tax Expense	16,000,000	5,600,000	33,000,000
Deferred Federal Income Tax Expense (Benefit)	11,400,000	(12,800,000)	(21,400,000)
Deferred State Income Tax Expense (Benefit)	2,400,000	(2,100,000)	(6,400,000)
Deferred Income Tax Expense (Benefit)	13,800,000	(14,900,000)	(27,800,000)
Income Tax Expense (Benefit)	$ 29,806,000	$ (9,292,000)	$ 5,175,000