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Earnings per Share - Details of Earnings Per Share Calculations (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings per Common Share
Net income (loss)	$ (2,461)	$ (5,671)	$ (1,002)	$ 1,792	$ (8,133)	$ 790
Weighted average common shares outstanding:
Basic (in shares)	40,038		39,908		40,037	39,902
Incremental shares with dilutive effect:
Restricted stock awards (in shares)						113
Diluted (in shares)	40,038		39,908		40,037	40,015
Basic (in dollars per share)	$ (0.06)		$ (0.03)		$ (0.20)	$ 0.02
Diluted (in dollars per share)	$ (0.06)		$ (0.03)		$ (0.20)	$ 0.02

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