CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($) $ in Thousands	Total	Common Stock Class A common stock	Common Stock Class B Common Stock	Treasury Stock	Additional Paid-In Capital	Retained Earnings
Beginning balance (in shares) at Dec. 31, 2018		12,995,080,000	3,560,604,000	0
Beginning balance at Dec. 31, 2018	$ 389,829	$ 0	$ 0	$ 0	$ 328,404	$ 61,425
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	451					451
Shares returned in lieu of tax payments (in shares)				34,704
Shares returned in lieu of tax payments	(633)			$ (633)
Conversion of Class B Common Stock (in shares)		751,633,000	(751,633,000)
Exercise of warrants (in shares)		177,186,000
Issuance of common stock (in shares)		68,246,000	3,035,000
Stock-based compensation expense	1,208				1,208
Ending balance (in shares) at Mar. 31, 2019		13,992,145,000	2,812,006,000	34,704
Ending balance at Mar. 31, 2019	390,855	$ 0	$ 0	$ (633)	329,612	61,876
Beginning balance (in shares) at Dec. 31, 2018		12,995,080,000	3,560,604,000	0
Beginning balance at Dec. 31, 2018	389,829	$ 0	$ 0	$ 0	328,404	61,425
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	43,312
Ending balance (in shares) at Jun. 30, 2019		14,328,538,000	2,696,853,000	67,833
Ending balance at Jun. 30, 2019	434,299	$ 0	$ 0	$ (1,156)	330,718	104,737
Beginning balance (in shares) at Mar. 31, 2019		13,992,145,000	2,812,006,000	34,704
Beginning balance at Mar. 31, 2019	390,855	$ 0	$ 0	$ (633)	329,612	61,876
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	42,861					42,861
Shares returned in lieu of tax payments (in shares)				33,129
Shares returned in lieu of tax payments	(523)			$ (523)
Conversion of Class B Common Stock (in shares)		115,153,000	(115,153,000)
Exercise of warrants (in shares)		170,659,000
Issuance of common stock (in shares)		50,581,000
Stock-based compensation expense	1,106				1,106
Ending balance (in shares) at Jun. 30, 2019		14,328,538,000	2,696,853,000	67,833
Ending balance at Jun. 30, 2019	434,299	$ 0	$ 0	$ (1,156)	330,718	104,737
Beginning balance (in shares) at Dec. 31, 2019		15,681,439,000	1,926,848,000	68,658
Beginning balance at Dec. 31, 2019	455,216	$ 0	$ 0	$ (1,171)	333,705	122,682
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	(7,351)					(7,351)
Shares returned in lieu of tax payments (in shares)				75,493
Shares returned in lieu of tax payments	(1,072)			$ (1,072)
Conversion of Class B Common Stock (in shares)		38,563,000	(38,563,000)
Exercise of warrants (in shares)		121,114,000
Issuance of common stock (in shares)		112,569,000
Stock-based compensation expense	719				719
Ending balance (in shares) at Mar. 31, 2020		15,953,685,000	1,888,285,000	144,151
Ending balance at Mar. 31, 2020	447,512	$ 0	$ 0	$ (2,243)	334,424	115,331
Beginning balance (in shares) at Dec. 31, 2019		15,681,439,000	1,926,848,000	68,658
Beginning balance at Dec. 31, 2019	455,216	$ 0	$ 0	$ (1,171)	333,705	122,682
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	(43,667)
Ending balance (in shares) at Jun. 30, 2020		17,743,414,000	2,574,600,000	174,222
Ending balance at Jun. 30, 2020	412,010	$ 0	$ 0	$ (2,414)	335,409	79,015
Beginning balance (in shares) at Mar. 31, 2020		15,953,685,000	1,888,285,000	144,151
Beginning balance at Mar. 31, 2020	447,512	$ 0	$ 0	$ (2,243)	334,424	115,331
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	(36,316)					(36,316)
Shares returned in lieu of tax payments (in shares)				30,071
Shares returned in lieu of tax payments	(171)			$ (171)
Exercise of warrants (in shares)		1,723,253,000	686,315,000
Issuance of common stock (in shares)		66,476,000
Stock-based compensation expense	985				985
Ending balance (in shares) at Jun. 30, 2020		17,743,414,000	2,574,600,000	174,222
Ending balance at Jun. 30, 2020	$ 412,010	$ 0	$ 0	$ (2,414)	$ 335,409	$ 79,015