Annual report pursuant to Section 13 and 15(d)

Income Taxes (Narrative) (Details)

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Income Taxes (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Taxes [Abstract]      
Cash paid for income taxes $ 35,655,000 $ 12,000,000 $ 100,000
Refund of federal income taxes paid in prior years 400,000 99,800,000 22,300,000
Recognized income tax expense for interest and penalties $ 300,000