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Earnings Per Share Level 4 (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Earnings Per Share, Basic and Dilutive [Line Items]        
Net Income $ 120,113,000 $ 18,759,000 $ 146,144,000 $ 29,230,000
Interest Expense, Subordinated Notes and Debentures 0 257,000 0 515,000
Net Income (Loss) Available to Common Stockholders, Diluted 120,113,000 19,016,000 146,144,000 29,745,000
Weighted Average Number of Shares Outstanding, Basic 64,254,387 59,943,337 63,786,577 59,821,937
Incremental Common Shares Attributable to Share-based Payment Arrangements 1,118,056 514,429 1,013,455 570,525
Weighted Average Number of Shares Outstanding, Diluted 70,382,065 64,253,628 69,882,240 64,229,656
Earnings Per Share, Basic $ 1.87 $ 0.31 $ 2.29 $ 0.49
Earnings Per Share, Diluted $ 1.71 $ 0.30 $ 2.09 $ 0.46
Convertible Subordinated Debt [Member]
        
Earnings Per Share, Basic and Dilutive [Line Items]        
Incremental Common Shares Attributable to Conversion of Debt Securities 0 2,637,176 0 2,678,508
Convertible Notes Payable [Member]
        
Earnings Per Share, Basic and Dilutive [Line Items]        
Incremental Common Shares Attributable to Conversion of Debt Securities 5,009,622 1,158,686 5,082,208 1,158,686
Stock Options [Member]
        
Earnings Per Share, Basic and Dilutive [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 0 1,502,900 0 1,502,900
Minimum [Member]
        
Earnings Per Share, Basic and Dilutive [Line Items]        
Stock Options, Excluded from Diluted Earnings per Share, Range of Exercise Prices 0 11.88 0 11.88
Maximum [Member]
        
Earnings Per Share, Basic and Dilutive [Line Items]        
Stock Options, Excluded from Diluted Earnings per Share, Range of Exercise Prices $ 0 $ 14.34 $ 0 $ 14.34