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Level 4 Net Income Per Common Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Computation of basic and diluted net income per common share        
Net income $ 10,412 $ 15,047 $ 91,248 $ 16,715
Weighted average common shares outstanding during the period (for basic calculation) 43,229,000 29,700,000 40,415,000 29,700,000
Dilutive effect of other potential common shares 4,000 0 2,000 0
Weighted average common shares and potential common shares (for diluted calculation) 43,233,000 29,700,000 40,417,000 29,700,000
Net income per common share - Basic $ 0.24 $ 0.51 $ 2.26 $ 0.56
Net income per common share - Diluted $ 0.24 $ 0.51 $ 2.26 $ 0.56
Antidilutive stock options 200,000 0 100,000 0