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Earnings Per Share Level 4 (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Earnings Per Share, Basic and Dilutive [Line Items]        
Net income $ (7,829) $ (13,068) $ 21,401 $ 36,549
Interest Expense, Subordinated Notes and Debentures 2 258 517 775
Net Income (Loss) Available to Common Stockholders, Diluted $ (7,827) $ (12,810) $ 21,918 $ 37,324
Earnings per common share 62,504,421 59,595,846 60,722,625 59,428,844
Incremental Common Shares Attributable to Share-based Payment Arrangements 545,877 375,497 562,309 627,347
Earnings per common share - assuming dilution 65,261,926 62,698,427 65,232,085 62,783,275
Earnings per common share $ (0.13) $ (0.22) $ 0.35 $ 0.62
Earnings per common share - assuming dilution $ (0.13) $ (0.22) $ 0.34 $ 0.59
Convertible Subordinated Debt [Member]
        
Earnings Per Share, Basic and Dilutive [Line Items]        
Incremental Common Shares Attributable to Conversion of Debt Securities 65,688 2,727,084 1,801,211 2,727,084
Convertible Notes Payable [Member]
        
Earnings Per Share, Basic and Dilutive [Line Items]        
Incremental Common Shares Attributable to Conversion of Debt Securities 2,145,940 0 2,145,940 0