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Earnings per Share - Details of Earnings Per Share Calculations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings per Common Share
Net income (loss)	$ 11,872	$ (2,461)	$ (5,671)	$ (908)	$ (1,002)	$ 1,792	$ 3,739	$ (118)
Weighted average common shares outstanding:
Basic (in shares)	40,062			39,922			40,037	39,924
Incremental shares with dilutive effect:
Restricted stock awards (in shares)	67						62
Diluted (in shares)	40,129			39,922			40,099	39,924
Basic (in dollars per share)	$ 0.30			$ (0.02)			$ 0.09	$ 0.00
Diluted (in dollars per share)	$ 0.30			$ (0.02)			$ 0.09	$ 0.00

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