UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Treasury Stock	Paid-in Capital	Management Notes Receivable	Accumulated Deficit	Accumulated Other Comprehensive (Loss) Income
Equity, beginning balance at Dec. 31, 2018	$ 602,825	$ 0	$ 14	$ 0	$ 619,621	$ (1,619)	$ (16,035)	$ 844
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Interest on management notes receivable	(21)				0	(21)
Stockholders' redemption	(2,000)				(2,000)
Stock-based incentive compensation	584				584
Net loss	(3,712)						(3,712)
Other comprehensive income (loss)	(505)							(505)
Equity, ending balance at Mar. 31, 2019	597,171	0	14	0	618,205	(1,640)	(19,747)	339
Equity, beginning balance at Dec. 31, 2018	602,825	0	14	0	619,621	(1,619)	(16,035)	844
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(17,315)
Other comprehensive income (loss)	(478)
Equity, ending balance at Jun. 30, 2019	584,146	0	14	0	618,403	(1,287)	(33,350)	366
Equity, beginning balance at Mar. 31, 2019	597,171	0	14	0	618,205	(1,640)	(19,747)	339
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Interest on management notes receivable	(18)					(18)
Stockholders' redemption	0				(371)	371
Stock-based incentive compensation	569				569
Net loss	(13,603)						(13,603)
Other comprehensive income (loss)	27							27
Equity, ending balance at Jun. 30, 2019	584,146	0	14	0	618,403	(1,287)	(33,350)	366
Equity, beginning balance at Dec. 31, 2019	906,827	0	18	(2,403)	1,008,362	0	(91,955)	(7,195)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options, vesting of restricted stock and related tax withholdings	(549)				(549)
Stock-based incentive compensation	757				757
Net loss	(19,910)						(19,910)
Other comprehensive income (loss)	(16,632)							(16,632)
Equity, ending balance at Mar. 31, 2020	870,493	0	18	(2,403)	1,008,570	0	(111,865)	(23,827)
Equity, beginning balance at Dec. 31, 2019	906,827	0	18	(2,403)	1,008,362	0	(91,955)	(7,195)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(27,578)
Other comprehensive income (loss)	(12,056)
Equity, ending balance at Jun. 30, 2020	867,966	0	18	(2,403)	1,009,135	0	(119,533)	(19,251)
Equity, beginning balance at Mar. 31, 2020	870,493	0	18	(2,403)	1,008,570	0	(111,865)	(23,827)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options, vesting of restricted stock and related tax withholdings	(96)				(96)
Stock-based incentive compensation	661				661
Net loss	(7,668)						(7,668)
Other comprehensive income (loss)	4,576							4,576
Equity, ending balance at Jun. 30, 2020	$ 867,966	$ 0	$ 18	$ (2,403)	$ 1,009,135	$ 0	$ (119,533)	$ (19,251)