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Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Basic and Diluted Earnings per Share [Line Items]
Net income (loss) from continuing operations	$ 44,521	$ 20,364
Weighted-average common shares outstanding (in shares)	25,130,961	24,915,772
Weighted-average common shares for EPS calculation (in shares)	25,604,268	25,458,090
Earnings per common share from continuing operations, basic (in dollars per share)	$ 1.77	$ 0.82
Earnings per common share from continuing operations, diluted (in dollars per share)	1.74	0.80
Earnings (loss) per common share from discontinued operations, basic (in dollars per share)	0	(0.08)
Earnings (loss) per common share from discontinued operations, diluted (in dollars per share)	0	(0.07)
Gain on sale of discontinued operations, net of taxes, basic (in dollars per share)	0	1.10
Gain on sale of discontinued operations, net of taxes, diluted (in dollars per share)	0	1.07
Earnings per common share, basic (in dollars per share)	1.77	1.84
Earnings per common share, diluted (in dollars per share)	$ 1.74	$ 1.80
Awards excluded from diluted earnings per share calculation (in shares)	63,897	0
Restricted Stock Unit Awards
Basic and Diluted Earnings per Share [Line Items]
Add dilutive effect of share-based awards outstanding (in shares)	260,829	290,083
Stock Options
Basic and Diluted Earnings per Share [Line Items]
Add dilutive effect of share-based awards outstanding (in shares)	212,478	252,235

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