Unaudited Condensed Consolidated Statement of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Class A Voting Common Stock	Series A-1 Preferred Stock	Additional Paid-in Capital	Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2017		24,506,647	83,968
Beginning balance at Dec. 31, 2017	$ 203,690	$ 142,655		$ 174,871	$ (113,836)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Payment-in-kind dividends (in shares)			1,889
Issued pursuant to stock based compensation plan (in shares)		127,666
Issued pursuant to stock-based compensation plan	(610)			(610)
Stock-based compensation	216			216
Net income (loss)	(16,537)				(16,537)
Ending balance (in shares) at Mar. 31, 2018		24,634,313	85,857
Ending balance at Mar. 31, 2018	186,759	$ 142,655		174,477	(130,373)
Beginning balance (in shares) at Dec. 31, 2017		24,506,647	83,968
Beginning balance at Dec. 31, 2017	203,690	$ 142,655		174,871	(113,836)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(57,840)
Ending balance (in shares) at Sep. 30, 2018		24,637,127	89,764
Ending balance at Sep. 30, 2018	145,438	$ 142,655		174,459	(171,676)
Beginning balance (in shares) at Mar. 31, 2018		24,634,313	85,857
Beginning balance at Mar. 31, 2018	186,759	$ 142,655		174,477	(130,373)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Payment-in-kind dividends (in shares)			1,932
Issued pursuant to stock based compensation plan (in shares)		2,814
Issued pursuant to stock-based compensation plan	(17)			(17)
Stock-based compensation	9			9
Net income (loss)	(21,593)				(21,593)
Ending balance (in shares) at Jun. 30, 2018		24,637,127	87,789
Ending balance at Jun. 30, 2018	165,158	$ 142,655		174,469	(151,966)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Payment-in-kind dividends (in shares)			1,975
Retirement of Class B Common Stock	(10)			(10)
Net income (loss)	(19,710)				(19,710)
Ending balance (in shares) at Sep. 30, 2018		24,637,127	89,764
Ending balance at Sep. 30, 2018	145,438	$ 142,655		174,459	(171,676)
Beginning balance (in shares) at Dec. 31, 2018		24,645,825	91,784
Beginning balance at Dec. 31, 2018	222,547	$ 142,655		174,379	(94,487)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Payment-in-kind dividends (in shares)			2,065
Issued pursuant to stock based compensation plan (in shares)		127,818
Issued pursuant to stock-based compensation plan	627			627
Net income (loss)	(58,564)				(58,564)
Ending balance (in shares) at Mar. 31, 2019		24,773,643	93,849
Ending balance at Mar. 31, 2019	164,610	$ 142,655		175,006	(153,051)
Beginning balance (in shares) at Dec. 31, 2018		24,645,825	91,784
Beginning balance at Dec. 31, 2018	222,547	$ 142,655		174,379	(94,487)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Payment-in-kind dividends (in shares)			6,336
Net income (loss)	(29,058)
Ending balance (in shares) at Sep. 30, 2019		24,933,853	98,120
Ending balance at Sep. 30, 2019	194,819	$ 142,655		175,709	(123,545)
Beginning balance (in shares) at Mar. 31, 2019		24,773,643	93,849
Beginning balance at Mar. 31, 2019	164,610	$ 142,655		175,006	(153,051)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Payment-in-kind dividends (in shares)			2,112
Issued pursuant to stock based compensation plan (in shares)		160,210
Issued pursuant to stock-based compensation plan	703			703
Net income (loss)	13,289				13,289
Ending balance (in shares) at Jun. 30, 2019		24,933,853	95,961
Ending balance at Jun. 30, 2019	178,602	$ 142,655		175,709	(139,762)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Payment-in-kind dividends (in shares)			2,159
Net income (loss)	16,217				16,217
Ending balance (in shares) at Sep. 30, 2019		24,933,853	98,120
Ending balance at Sep. 30, 2019	$ 194,819	$ 142,655		$ 175,709	$ (123,545)