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Earnings Per Share Level 4 (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Earnings Per Share, Basic and Dilutive [Line Items]                      
Net Income $ 36,397 $ (7,829) $ 18,759 $ 10,471 $ 49,699 $ (13,068) $ 18,274 $ 31,343 $ 57,798 $ 86,248 $ 42,933
Interest Expense, Subordinated Notes and Debentures                 517 1,034 1,035
Net Income (Loss) Available to Common Stockholders, Diluted                 $ 58,315 $ 87,282 $ 43,968
Weighted Average Number of Shares Outstanding, Basic                 61,258,825 59,482,349 58,506,804
Incremental Common Shares Attributable to Share-based Payment Arrangements                 553,312 561,898 438,834
Weighted Average Number of Shares Outstanding, Diluted                 65,675,651 63,619,495 64,579,723
Earnings Per Share, Basic $ 0.58 $ (0.13) $ 0.31 $ 0.18 $ 0.83 $ (0.22) $ 0.31 $ 0.53 $ 0.94 $ 1.45 $ 0.73
Earnings Per Share, Diluted $ 0.55 $ (0.13) $ 0.30 $ 0.16 $ 0.79 $ (0.22) $ 0.28 $ 0.48 $ 0.89 $ 1.37 $ 0.68
Convertible Subordinated Debt [Member]
                      
Earnings Per Share, Basic and Dilutive [Line Items]                      
Incremental Common Shares Attributable to Conversion of Debt Securities                 1,348,447 2,727,084 2,729,514
Convertible Notes Payable [Member]
                      
Earnings Per Share, Basic and Dilutive [Line Items]                      
Incremental Common Shares Attributable to Conversion of Debt Securities                 2,515,067 848,164 2,904,571