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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Earnings Per Share [Abstract]        
Net earnings $ 23,147 $ 17,681 $ 50,445 $ 44,947
Basic weighted average shares 53,039,000 52,824,000 53,036,000 52,809,000
Basic earnings per common share $ 0.44 $ 0.33 $ 0.95 $ 0.85
Effect of dilutive stock options 322,000 250,000 333,000 238,000
Diluted weighted average shares 53,361,000 53,074,000 53,369,000 53,047,000
Diluted earnings per common share $ 0.43 $ 0.33 $ 0.95 $ 0.85
Earnings Per Share (Details) [Abstract]        
Number of anti-dilutive stock awards 2,041,664 2,398,269 2,041,664 2,418,436