Guarantor/Non Guarantor Condensed Consolidating Financial Statements (Cash Flows)) (Details) - USD ($) $ in Thousands	4 Months Ended	5 Months Ended	9 Months Ended
Sep. 30, 2020	May 31, 2020	Sep. 30, 2019
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	$ (737)	$ (2,245)	$ 8,638
Cash flows from investing activities:
Purchases of property and equipment	(2,384)	(10,848)	(40,543)
Proceeds from sale of property and equipment	8,303	1,665	4,778
Proceeds from insurance recoveries	155	22	641
Net cash provided by (used in) investing activities	6,074	(9,161)	(35,124)
Cash flows from financing activities:
Debt repayments	0	(175,000)	0
Proceeds from debt issuance	0	195,187	0
Proceeds from DIP Facility	0	4,000	0
Repayment of DIP Facility	0	(4,000)	0
Payments of debt issuance costs	0	(7,625)	0
Purchase of treasury stock	0	(8)	(125)
Intercompany contributions/distributions	0	0	0
Net cash provided by (used in) financing activities	0	12,554	(125)
Net increase (decrease) in cash, cash equivalents and restricted cash	5,337	1,148	(26,611)
Beginning cash, cash equivalents, and restricted cash	26,765	25,617	54,564
Ending cash, cash equivalents, and restricted cash	32,102	26,765	27,953
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	0	0	0
Cash flows from investing activities:
Purchases of property and equipment	0	0	0
Proceeds from sale of property and equipment	0	(154)	0
Proceeds from insurance recoveries	0	0	0
Net cash provided by (used in) investing activities	0	(154)	0
Cash flows from financing activities:
Debt repayments		0
Proceeds from debt issuance		0
Proceeds from DIP Facility		0
Repayment of DIP Facility		0
Payments of debt issuance costs		0
Purchase of treasury stock		0	0
Intercompany contributions/distributions	0	154	0
Net cash provided by (used in) financing activities	0	154	0
Net increase (decrease) in cash, cash equivalents and restricted cash	0	0	0
Beginning cash, cash equivalents, and restricted cash	0	0	0
Ending cash, cash equivalents, and restricted cash	0	0	0
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	20,169	132,354	41,854
Cash flows from investing activities:
Purchases of property and equipment	(1,991)	(8,755)	(36,644)
Proceeds from sale of property and equipment	8,271	1,819	4,688
Proceeds from insurance recoveries	155	22	641
Net cash provided by (used in) investing activities	6,435	(6,914)	(31,315)
Cash flows from financing activities:
Debt repayments		0
Proceeds from debt issuance		0
Proceeds from DIP Facility		0
Repayment of DIP Facility		0
Payments of debt issuance costs		0
Purchase of treasury stock		0	0
Intercompany contributions/distributions	(26,604)	(125,440)	(10,539)
Net cash provided by (used in) financing activities	(26,604)	(125,440)	(10,539)
Net increase (decrease) in cash, cash equivalents and restricted cash	0	0	0
Beginning cash, cash equivalents, and restricted cash	0	0	0
Ending cash, cash equivalents, and restricted cash	0	0	0
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	(4,314)	(6,839)	4,961
Cash flows from investing activities:
Purchases of property and equipment	(380)	(1,524)	(3,262)
Proceeds from sale of property and equipment	14	0	90
Proceeds from insurance recoveries	0	0	0
Net cash provided by (used in) investing activities	(366)	(1,524)	(3,172)
Cash flows from financing activities:
Debt repayments		0
Proceeds from debt issuance		0
Proceeds from DIP Facility		0
Repayment of DIP Facility		0
Payments of debt issuance costs		0
Purchase of treasury stock		0	0
Intercompany contributions/distributions	(13)	8,363	(245)
Net cash provided by (used in) financing activities	(13)	8,363	(245)
Net increase (decrease) in cash, cash equivalents and restricted cash	(4,693)	0	1,544
Beginning cash, cash equivalents, and restricted cash	10,158	10,158	3,216
Ending cash, cash equivalents, and restricted cash	5,465	10,158	4,760
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	(16,592)	(127,760)	(38,177)
Cash flows from investing activities:
Purchases of property and equipment	(13)	(569)	(637)
Proceeds from sale of property and equipment	18	0	0
Proceeds from insurance recoveries	0	0	0
Net cash provided by (used in) investing activities	5	(569)	(637)
Cash flows from financing activities:
Debt repayments		(175,000)
Proceeds from debt issuance		195,187
Proceeds from DIP Facility		4,000
Repayment of DIP Facility		(4,000)
Payments of debt issuance costs		(7,625)
Purchase of treasury stock		(8)	(125)
Intercompany contributions/distributions	26,617	116,923	10,784
Net cash provided by (used in) financing activities	26,617	129,477	10,659
Net increase (decrease) in cash, cash equivalents and restricted cash	10,030	1,148	(28,155)
Beginning cash, cash equivalents, and restricted cash	16,607	15,459	51,348
Ending cash, cash equivalents, and restricted cash	$ 26,637	$ 16,607	$ 23,193

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