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Net Income per Common Share - Potential Dilutive Stock Options On Weighted Average Shares Outstanding (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Net Income per Common Share
Net income	$ 3,754	$ 864	$ 9,211	$ 5,240	$ 4,150
Basic weighted average shares of common stock outstanding	57,315,472	56,839,823	57,218,389	56,818,406
Dilutive effect of stock-based awards	998,651	536,115	934,961	926,411
Diluted weighted average common shares outstanding	58,314,123	57,375,938	58,153,350	57,744,817
Net income per common share:
Basic	$ 0.07	$ 0.02	$ 0.16	$ 0.09
Diluted	$ 0.06	$ 0.02	$ 0.16	$ 0.09

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