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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
	Mar. 31, 2019	Mar. 31, 2018
Earnings per Common Share
Net income (loss)	$ (5,671)	$ 1,792
Weighted average common shares outstanding:
Basic (in shares)	40,036	39,910
Incremental shares with dilutive effect:
Restricted stock awards (in shares)		149
Diluted (in shares)	40,036	40,059
Basic (in dollars per share)	$ (0.14)	$ 0.04
Diluted (in dollars per share)	$ (0.14)	$ 0.04

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