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Level 4 Net Income Per Common Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Computation of basic and diluted net income per common share    
Net income $ 80,836 $ 1,668
Weighted average common shares outstanding during the period (for basic calculation) 37,569,000 29,700,000
Dilutive effect of other potential common shares 0 0
Weighted average common shares and potential common shares (for diluted calculation) 37,569,000 29,700,000
Net income per common share - Basic $ 2.15 $ 0.06
Net income per common share - Diluted $ 2.15 $ 0.06
Antidilutive stock options, RSUs and PSUs 100,000 0