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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Earnings Per Share [Abstract]        
Net earnings (loss) $ (4,092) $ 25,925 $ 46,353 $ 70,872
Basic weighted average shares 53,060,000 52,864,000 53,044,000 52,828,000
Basic earnings (loss) per common share $ (0.08) $ 0.49 $ 0.87 $ 1.34
Effect of dilutive stock options 273,000 250,000 313,000 241,000
Diluted weighted average shares 53,333,000 53,114,000 53,357,000 53,069,000
Diluted earnings (loss) per common share $ (0.08) $ 0.49 $ 0.87 $ 1.34
Earnings Per Share (Details) [Abstract]        
Number of anti-dilutive stock awards 2,676,685 2,507,547 2,302,669 2,513,948