Guarantor/Non Guarantor Condensed Consolidating Financial Statements (Statements of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Condensed Financial Statements, Captions [Line Items]
Revenues	$ 114,322	$ 146,568
Costs and expenses:
Operating costs	92,022	108,585
Depreciation	21,984	22,653
General and administrative	14,655	19,758
Pre-petition restructuring charges	17,074	0
Impairment	17,853	1,046
Bad debt expense	727	62
Gain (loss) on dispositions of property and equipment, net	717	1,075
Intercompany leasing	0	0
Total costs and expenses	163,598	151,029
Income (loss) from operations	(49,276)	(4,461)
Other income (expense):
Equity in earnings of subsidiaries	0	0
Interest expense, net of interest capitalized	(8,651)	(9,885)
Reorganization Items	(6,663)	0
Other income, net	(5,545)	684
Total other income (expense), net	(20,859)	(9,201)
Income (loss) before income taxes	(70,135)	(13,662)
Income tax (expense) benefit	1,031	(1,453)
Net income (loss)	(69,104)	(15,115)
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Revenues	0	0
Costs and expenses:
Operating costs	0	0
Depreciation	0	0
General and administrative	(135)	(135)
Pre-petition restructuring charges	0
Impairment	0	0
Bad debt expense	0	0
Gain (loss) on dispositions of property and equipment, net	0	0
Intercompany leasing	0	0
Total costs and expenses	(135)	(135)
Income (loss) from operations	135	135
Other income (expense):
Equity in earnings of subsidiaries	31,726	(5,232)
Interest expense, net of interest capitalized	0	0
Reorganization Items	0
Other income, net	(135)	(135)
Total other income (expense), net	31,591	(5,367)
Income (loss) before income taxes	31,726	(5,232)
Income tax (expense) benefit	0	0
Net income (loss)	31,726	(5,232)
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Revenues	99,867	124,925
Costs and expenses:
Operating costs	79,885	92,102
Depreciation	20,456	21,030
General and administrative	8,212	11,446
Pre-petition restructuring charges	0
Impairment	17,853	1,046
Bad debt expense	727	62
Gain (loss) on dispositions of property and equipment, net	720	984
Intercompany leasing	(1,215)	(1,215)
Total costs and expenses	125,198	123,487
Income (loss) from operations	(25,331)	1,438
Other income (expense):
Equity in earnings of subsidiaries	(6,508)	2,464
Interest expense, net of interest capitalized	1	(14)
Reorganization Items	0
Other income, net	234	266
Total other income (expense), net	(6,273)	2,716
Income (loss) before income taxes	(31,604)	4,154
Income tax (expense) benefit	6,386	(1,386)
Net income (loss)	(25,218)	2,768
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Revenues	14,455	21,643
Costs and expenses:
Operating costs	12,137	16,483
Depreciation	1,301	1,343
General and administrative	635	451
Pre-petition restructuring charges	0
Impairment	0	0
Bad debt expense	0	0
Gain (loss) on dispositions of property and equipment, net	0	91
Intercompany leasing	1,215	1,215
Total costs and expenses	15,288	19,401
Income (loss) from operations	(833)	2,242
Other income (expense):
Equity in earnings of subsidiaries	0	0
Interest expense, net of interest capitalized	17	3
Reorganization Items	0
Other income, net	(5,607)	347
Total other income (expense), net	(5,590)	350
Income (loss) before income taxes	(6,423)	2,592
Income tax (expense) benefit	(85)	(128)
Net income (loss)	(6,508)	2,464
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Revenues	0	0
Costs and expenses:
Operating costs	0	0
Depreciation	227	280
General and administrative	5,943	7,996
Pre-petition restructuring charges	17,074
Impairment	0	0
Bad debt expense	0	0
Gain (loss) on dispositions of property and equipment, net	(3)	0
Intercompany leasing	0	0
Total costs and expenses	23,247	8,276
Income (loss) from operations	(23,247)	(8,276)
Other income (expense):
Equity in earnings of subsidiaries	(25,218)	2,768
Interest expense, net of interest capitalized	(8,669)	(9,874)
Reorganization Items	(6,663)
Other income, net	(37)	206
Total other income (expense), net	(40,587)	(6,900)
Income (loss) before income taxes	(63,834)	(15,176)
Income tax (expense) benefit	(5,270)	61
Net income (loss)	$ (69,104)	$ (15,115)