Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Basic and Diluted Earnings per Share [Line Items]
Net income (loss) from continuing operations	$ 11,070	$ (19,082)	$ 31,591	$ (389)
Weighted-average common shares outstanding (in shares)	25,052,627	24,960,086	24,982,155	25,177,133
Weighted-average common shares for EPS calculation (in shares)	25,626,951	24,960,086	25,607,305	25,666,405
Earnings (loss) per common share from continuing operations, basic (in dollars per share)	$ 0.44	$ (0.77)	$ 1.26	$ (0.01)
Earnings (loss) per common share from continuing operations, diluted (in dollars per share)	0.43	(0.77)	1.23	(0.01)
Earnings per common share from discontinued operations, basic (in dollars per share)	0	0.05	(0.08)	0.21
Earnings per common share from discontinued operations, diluted (in dollars per share)	0	0.05	(0.07)	0.21
Gain on sale of discontinued operations, net of taxes, basic (in dollars per share)			1.10	0
Gain on sale of discontinued operations, net of taxes, diluted (in dollars per share)			1.07	0
Earnings (loss) per common share, basic (in dollars per share)	0.44	(0.72)	2.28	0.20
Earnings (loss) per common share, diluted (in dollars per share)	$ 0.43	$ (0.72)	$ 2.23	$ 0.20
Awards excluded from diluted earnings per share calculation (in shares)	0	0	2,681	0
Restricted Stock Unit Awards
Basic and Diluted Earnings per Share [Line Items]
Add dilutive effect of share-based awards outstanding (in shares)	279,636	0	279,636	253,082
Stock Options
Basic and Diluted Earnings per Share [Line Items]
Add dilutive effect of share-based awards outstanding (in shares)	294,688	0	345,514	236,190