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Earnings (Loss) Per Share (Schedule of Earnings (Loss) Per Share, Basic and Diluted) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Earnings Per Share, Basic and Dilutive [Line Items]        
Net income (loss) $ 56,181 $ (7,829) $ 202,325 $ 21,401
Interest on convertible subordinated debentures (net of income tax benefit) 0 2 0 517
Numerator for earnings (loss) per common share - assuming dilution $ 56,181 $ (7,827) $ 202,325 $ 21,918
Weighted average common shares outstanding 65,129,442 [1] 62,504,421 [1] 64,239,117 [1] 60,722,625 [1]
Effect of dilutive securities: 2015 warrants (shares) 1,388,826 0 462,942 0
Effect of dilutive securities: stock options and deferred compensation agreements (shares) 1,440,101 545,877 1,155,670 562,309
Denominator for earnings (loss) per common share - assuming dilution (shares) 74,559,716 65,261,926 72,459,076 65,232,085
Earnings (loss) per common share $ 0.86 $ (0.13) $ 3.15 $ 0.35
Earnings (loss) per common share - assuming dilution $ 0.75 $ (0.13) $ 2.79 $ 0.34
Convertible Subordinated Debentures [Member]
        
Earnings Per Share, Basic and Dilutive [Line Items]        
Effect of dilutive securities: conversion of debt securities (shares) 0 65,688 0 1,801,211
Convertible Senior Notes [Member]
        
Earnings Per Share, Basic and Dilutive [Line Items]        
Effect of dilutive securities: conversion of debt securities (shares) 6,601,347 2,145,940 6,601,347 2,145,940
[1] Weighted average common shares outstanding include shares vested under the NMO Deferred Compensation Plan and exclude unallocated shares held by the ESOP.