Consolidated Statement of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common stock	Additional paid in capital	Treasury stock	Accumulated deficit
Balance at beginning of period (in shares) at Dec. 31, 2018		46,390,513
Balance at beginning of period at Dec. 31, 2018	$ 884,687	$ 467	$ 974,616	$ (4,936)	$ (85,460)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation (in shares)		94,078
Stock-based compensation	1,424	$ 1	1,423
Restricted stock forfeited (in shares)		(97,113)
Restricted stock forfeited or canceled	$ (1)	$ (1)
Repurchase of common stock (in shares)	(80,422)	(80,422)
Repurchase of common stock	$ (463)			(463)
Net income	(103,540)				(103,540)
Balance at end of period (in shares) at Mar. 31, 2019		46,307,056
Balance at end of period at Mar. 31, 2019	$ 782,107	$ 467	976,039	(5,399)	(189,000)
Balance at beginning of period (in shares) at Dec. 31, 2019	47,942,230	47,942,230
Balance at beginning of period at Dec. 31, 2019	$ 417,141	$ 485	977,174	(6,110)	(554,408)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation (in shares)		0
Stock-based compensation	705	$ 0	705
Restricted stock forfeited (in shares)		(22,494)
Restricted stock forfeited or canceled	$ (1)	$ (1)
Repurchase of common stock (in shares)	(3,856)	(3,856)
Repurchase of common stock	$ (6)			(6)
Net income	$ 4,917				4,917
Balance at end of period (in shares) at Mar. 31, 2020	47,915,880	47,915,880
Balance at end of period at Mar. 31, 2020	$ 422,602	$ 484	$ 977,879	$ (6,116)	$ (549,645)