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Earnings Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Earnings Per Share [Line Items]                      
Income available to common stockholders, Basic                 $ 191,164 $ 152,198 $ 403,072
Effect of dilutive securities: Options                 0 0 0
Income available to common stockholders after assumed conversions, Diluted                 $ 191,164 $ 152,198 $ 403,072
Weighted Shares, Basic                 54,825 54,792 54,770
Effect of dilutive securities: Options                 20 34 322
Weighted Shares, Diluted                 54,845 54,826 55,092
Per-Share Amount, Basic $ 1.45 $ (0.07) $ 1.04 $ 1.06 $ (0.43) $ 1.77 $ 0.33 $ 1.12 $ 3.49 $ 2.78 $ 7.36
Per-Share Amount, Diluted $ 1.45 $ (0.07) [1] $ 1.04 $ 1.06 $ (0.43) [1] $ 1.77 $ 0.32 $ 1.12 $ 3.49 $ 2.78 $ 7.32
Potentially dilutive securities                 504,000 448,000 685,000
Common Stock [Member]
                      
Earnings Per Share [Line Items]                      
Potentially dilutive securities                 103,000 93,000 74,000
[1] The dilutive impact of incremental shares is excluded from loss position in accordance with GAAP.