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Common Stock and Earnings per Share - Details of Earnings Per Share Calculations (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Common Stock and Earnings per Share
Net income	$ 1,792	$ 573
Weighted average common shares outstanding:
Basic (in shares)	39,910	39,760
Incremental shares with dilutive effect:
Incremental shares with dilutive effect (in shares)	149	10
Diluted (in shares)	40,059	39,770
Basic (in dollars per share)	$ 0.04	$ 0.01
Diluted (in dollars per share)	$ 0.04	$ 0.01

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