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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		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Common Stock and Earnings per Share
Net income	$ 2,755	$ 478	$ 3,438	$ 5,502
Weighted average common shares outstanding:
Basic (in shares)	39,811	39,736	39,792	39,709
Incremental shares with dilutive effect:
Incremental shares with dilutive effect, restricted stock awards (in shares)	10	98	10	77
Diluted	39,821	39,834	39,802	39,786
Basic income (loss) per share	$ 0.07	$ 0.01	$ 0.09	$ 0.14
Diluted income (loss) per share	$ 0.07	$ 0.01	$ 0.09	$ 0.14

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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