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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Earnings Per Share [Abstract]    
Net earnings (loss) $ 25,061 $ 27,298
Basic weighted average shares 53,085,000 53,033,000
Basic earnings (loss) per common share $ 0.47 $ 0.51
Effect of dilutive stock options 257,000 344,000
Diluted weighted average shares 53,342,000 53,377,000
Diluted earnings (loss) per common share $ 0.47 $ 0.51
Earnings Per Share (Details) [Abstract]    
Number of anti-dilutive stock awards 3,791,737 2,042,717