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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
Mar. 31, 2014
Mar. 31, 2013
Earnings Per Share, Basic and Dilutive [Line Items]    
Net income (loss) - numerator for earnings (loss) per common share $ (9,753) $ 26,031
Weighted average common shares outstanding (shares) 72,518,574 63,313,568
Effect of dilutive securities: 2015 warrants (shares) 2,372,404 0
Denominator for earnings (loss) per common share - assuming dilution 79,615,779 68,705,913
Earnings (loss) per common share $ (0.13) $ 0.41
Earnings (loss) per common share - assuming dilution $ (0.13) $ 0.38
Stock Options and Deferred Compensation Agreements [Member]
   
Earnings Per Share, Basic and Dilutive [Line Items]    
Effect of dilutive securities: share-based payment arrangements (shares) 1,287,267 908,853
Restricted Stock Units [Member]
   
Earnings Per Share, Basic and Dilutive [Line Items]    
Effect of dilutive securities: share-based payment arrangements (shares) 36,548 0
Convertible Senior Notes [Member]
   
Earnings Per Share, Basic and Dilutive [Line Items]    
Effect of dilutive securities: convertible senior notes (shares) 3,400,986 4,483,492