Consolidated Statements of Stockholders' Equity - 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 (in shares)				68,227
Treasury stock, net	(343)		(163)	$ (180)
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	(55,253)
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)
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 (in shares)				596,194
Treasury stock, net	(1,340)			$ (1,340)
Exercise of stock options	0
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)
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 (in shares)				(72,879)
Treasury stock, net	(7)		(3,263)	$ 3,256
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	(189,479)
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)
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 (in shares)				38,664
Treasury stock, net	(9)			$ (9)
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)