Consolidated Statement of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common stock	Additional paid in capital	Treasury stock	Accumulated deficit	Accumulated deficit Cumulative Effect, Period of Adoption, Adjustment
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 or canceled (in shares)			(97,113)
Restricted stock forfeited or canceled	(1)		$ (1)
Repurchase of common stock (in shares)			(80,422)
Repurchase of common stock	(463)				(463)
Net loss	(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, 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]
Repurchase of common stock (in shares)	(206,653)
Net loss	$ (148,769)
Balance at end of period (in shares) at Jun. 30, 2019			46,417,442
Balance at end of period at Jun. 30, 2019	737,744		$ 469	977,611	(6,107)	(234,229)
Balance at beginning of period (in shares) at Mar. 31, 2019			46,307,056
Balance at beginning of period at Mar. 31, 2019	782,107		$ 467	976,039	(5,399)	(189,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation (in shares)			160,400
Stock-based compensation	$ 1,250		$ 1	1,249
Repurchase of common stock (in shares)	(126,231)		(126,231)
Repurchase of common stock	$ (708)				(708)
Issuance of common stock - litigation settlement (in shares)			76,217
Issuance of common stock - litigation settlement	324		$ 1	323
Net loss	(45,229)					(45,229)
Balance at end of period (in shares) at Jun. 30, 2019			46,417,442
Balance at end of period at Jun. 30, 2019	$ 737,744		$ 469	977,611	(6,107)	(234,229)
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	$ (154)	$ 485	977,174	(6,110)	(554,408)	$ (154)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	705			705
Restricted stock forfeited or canceled (in shares)			(22,494)
Restricted stock forfeited or canceled	(1)		$ (1)
Repurchase of common stock (in shares)			(3,856)
Repurchase of common stock	(6)				(6)
Net loss	4,917					4,917
Balance at end of period (in shares) at Mar. 31, 2020			47,915,880
Balance at end of period at Mar. 31, 2020	$ 422,602		$ 484	977,879	(6,116)	(549,645)
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	$ (154)	$ 485	977,174	(6,110)	(554,408)	$ (154)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of common stock (in shares)	(96,505)
Net loss	$ (433,809)
Balance at end of period (in shares) at Jun. 30, 2020	47,790,146		47,790,146
Balance at end of period at Jun. 30, 2020	$ (16,059)		$ 483	977,957	(6,128)	(988,371)
Balance at beginning of period (in shares) at Mar. 31, 2020			47,915,880
Balance at beginning of period at Mar. 31, 2020	422,602		$ 484	977,879	(6,116)	(549,645)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	78			78
Restricted stock forfeited or canceled (in shares)			(93,085)
Restricted stock forfeited or canceled	$ (1)		$ (1)
Repurchase of common stock (in shares)	(92,649)		(32,649)
Repurchase of common stock	$ (12)				(12)
Net loss	$ (438,726)					(438,726)
Balance at end of period (in shares) at Jun. 30, 2020	47,790,146		47,790,146
Balance at end of period at Jun. 30, 2020	$ (16,059)		$ 483	$ 977,957	$ (6,128)	$ (988,371)