Consolidated Statements of Stockholders’ Equity (Deficit) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Treasury	Retained Deficit
Beginning balance (in shares) at Dec. 31, 2018		26,990,034		242,322
Beginning balance at Dec. 31, 2018	$ 219,428	$ 270	$ 464,264	$ (3,835)	$ (241,271)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuances of restricted stock (in shares)		277,865
Issuances of restricted stock	0	$ 3	(3)
Amortization of equity-classified share-based compensation	3,275		3,275
Treasury stock, net	(343)		(163)	$ (180)
Treasury stock, net (in shares)				68,227
Net loss	(27,476)				(27,476)
Ending balance (in shares) at Mar. 31, 2019		27,267,899		310,549
Ending balance at Mar. 31, 2019	194,884	$ 273	467,373	$ (4,015)	(268,747)
Beginning balance (in shares) at Dec. 31, 2018		26,990,034		242,322
Beginning balance at Dec. 31, 2018	219,428	$ 270	464,264	$ (3,835)	(241,271)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(94,130)
Ending balance (in shares) at Sep. 30, 2019		27,912,059		2,965,374
Ending balance at Sep. 30, 2019	127,945	$ 279	471,648	$ (8,581)	(335,401)
Beginning balance (in shares) at Mar. 31, 2019		27,267,899		310,549
Beginning balance at Mar. 31, 2019	194,884	$ 273	467,373	$ (4,015)	(268,747)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuances of restricted stock (in shares)		644,160
Issuances of restricted stock	0	$ 6	(6)
Amortization of equity-classified share-based compensation	3,329		3,329
Treasury stock, net	(1,340)			$ (1,340)
Treasury stock, net (in shares)				596,194
Net loss	(27,777)				(27,777)
Ending balance (in shares) at Jun. 30, 2019		27,912,059		906,743
Ending balance at Jun. 30, 2019	169,096	$ 279	470,696	$ (5,355)	(296,524)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuances of restricted stock	0
Amortization of equity-classified share-based compensation	1,165		1,165
Treasury stock, net	(3,439)		(213)	$ (3,226)
Treasury stock, net (in shares)				2,058,631
Net loss	(38,877)				(38,877)
Ending balance (in shares) at Sep. 30, 2019		27,912,059		2,965,374
Ending balance at Sep. 30, 2019	127,945	$ 279	471,648	$ (8,581)	(335,401)
Beginning balance (in shares) at Dec. 31, 2019		27,912,059		3,007,574
Beginning balance at Dec. 31, 2019	41,123	$ 279	472,594	$ (8,581)	(423,169)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuances of restricted stock	0
Amortization of equity-classified share-based compensation	1,336		1,336
Treasury stock, net	(7)		(3,263)	$ 3,256
Treasury stock, net (in shares)				(72,879)
Capital contribution	22,904		22,904
Net loss	(144,881)				(144,881)
Ending balance (in shares) at Mar. 31, 2020		27,912,059		2,934,695
Ending balance at Mar. 31, 2020	(79,525)	$ 279	493,571	$ (5,325)	(568,050)
Beginning balance (in shares) at Dec. 31, 2019		27,912,059		3,007,574
Beginning balance at Dec. 31, 2019	41,123	$ 279	472,594	$ (8,581)	(423,169)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(221,558)
Ending balance (in shares) at Sep. 30, 2020		27,912,059		3,012,127
Ending balance at Sep. 30, 2020	(156,065)	$ 279	493,717	$ (5,334)	(644,727)
Beginning balance (in shares) at Mar. 31, 2020		27,912,059		2,934,695
Beginning balance at Mar. 31, 2020	(79,525)	$ 279	493,571	$ (5,325)	(568,050)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuances of restricted stock	0
Amortization of equity-classified share-based compensation	78		78
Treasury stock, net	(9)			$ (9)
Treasury stock, net (in shares)				38,664
Net loss	(44,598)				(44,598)
Ending balance (in shares) at Jun. 30, 2020		27,912,059		2,973,359
Ending balance at Jun. 30, 2020	(124,053)	$ 279	493,649	$ (5,333)	(612,648)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuances of restricted stock	0
Amortization of equity-classified share-based compensation	68		68
Treasury stock, net	(1)			$ (1)
Treasury stock, net (in shares)				38,768
Net loss	(32,079)				(32,079)
Ending balance (in shares) at Sep. 30, 2020		27,912,059		3,012,127
Ending balance at Sep. 30, 2020	$ (156,065)	$ 279	$ 493,717	$ (5,334)	$ (644,727)