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Basis of Presentation - Calculations of Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Accounting Policies [Abstract]
Net (loss) income	$ (1,893)	$ 14,402
Less: Dividends and undistributed income (loss) allocated to participating securities	(2)	20
(Loss) income attributable to common stockholders	$ (1,891)	$ 14,382
Basic weighted-average common shares outstanding (in shares)	17,932	18,268
Add: dilutive effect of equity instruments (in shares)	0	165
Diluted weighted-average shares outstanding (in shares)	17,932	18,433
(Loss) earnings per share - basic (in dollars per share)	$ (0.11)	$ 0.79
(Loss) earnings per share - diluted (in dollars per share)	$ (0.11)	$ 0.78
Restricted Sock and Employee Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total shares excluded from diluted shares outstanding (in shares)	700	300

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