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Net Income Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Computation of basic and diluted net income per common share    
Net income $ 10,020 $ 4,950
Weighted average common shares outstanding during the period (for basic calculation) 38,500 38,853
Dilutive effect of other potential common shares 401 27
Weighted average common shares and potential common shares (for diluted calculation) 38,901 38,880
Net income per common share - Basic $ 0.26 $ 0.13
Net income per common share - Diluted $ 0.26 $ 0.13
Stock awards [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive stock awards 200 400