Annual report pursuant to Section 13 and 15(d)

Income Taxes (Schedule Of Effective Tax Rate Reconciliation) (Details)

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Income Taxes (Schedule Of Effective Tax Rate Reconciliation) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Taxes [Abstract]      
Income tax expense (benefit) at the federal statutory rate $ 92,517 $ 45,427 $ (91,710)
Income tax expense (benefit) at the federal statutory rate, tax rate 35.00% 35.00% 35.00%
Valuation allowance    (31,985) 14,594
Valuation allowance, tax rate    (24.60%) (5.60%)
Domestic production activities deduction (1,823) (2,623) 3,167
Domestic production activities deduction, tax rate (0.70%) (2.00%) (1.20%)
Share-based compensation       208
Share-based compensation, tax rate         
State income taxes 603 32 (73)
State income taxes, tax rate 0.20%      
Other 220 1,050 (297)
Other, tax rate 0.10% 0.80% 0.10%
Income tax expense (benefit) $ 91,517 $ 11,901 $ (74,111)
Effective income tax rate, total 34.60% 9.20% 28.30%