CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings (Accumulated Deficit)	Treasury Stock	Accumulated Other Comprehensive Income (Loss)
Balance at Dec. 31, 2016	$ 189,298	$ 39	$ 341,270	$ (119,327)	$ (28,182)	$ (4,502)
Comprehensive income	68,217			63,715		4,502
Cumulative effect of a change in accounting principle – adoption of ASU 2016-09 | Accounting Standards Update 2016-09 [Member]	6,538		74	6,464
Exercise of stock options	5,723	1	5,722
Tax withholding for share-based compensation	(4,481)		(4,481)
Share-based employee compensation expense	6,658		6,658
Balance at Dec. 31, 2017	271,953	40	349,243	(49,148)	(28,182)
Comprehensive income	98,803			98,803
Exercise of stock options and Warrants	1,910	1	1,909
Tax withholding for share-based compensation	(9,762)		(9,762)
Share-based employee compensation expense	6,097		6,097
Balance at Dec. 31, 2018	369,001	41	347,487	49,655	(28,182)
Comprehensive income	(298,912)			(286,821)		(12,091)
Issuance of Common Stock in connection with Merger	132,838	6	132,832
Share-based compensation replacement awards related to Merger and attributable to pre-combination services	9,107		9,107
Exercise of stock options	989	1	988
Tax withholding for share-based compensation	(4,733)		(4,733)
Share-based employee compensation expense	18,832		18,832
Other	(212)		(94)	(118)
Balance at Dec. 31, 2019	$ 226,910	$ 48	$ 504,419	$ (237,284)	$ (28,182)	$ (12,091)