Fresh Start Accounting - Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Nov. 20, 2018	Nov. 19, 2018
Assets:
Cash and cash equivalents	$ 278,620	$ 367,577	$ 388,500	$ 154,238
Restricted cash	6,089	21,498	58,675	1,034,470
Accounts receivable, net	29,252	40,549	28,879	28,881
Other receivable		28,000	28,000	28,000
Materials and supplies	43,933	40,429	40,307	83,800
Deferred costs, current	16,961	482		11,371
Prepaid expenses and other current assets	15,732	8,667	10,815	13,281
Total current assets	390,587	507,202	555,176	1,354,041
Property and equipment, net	1,842,549	1,915,172	1,920,474	4,422,709
Long-term receivable				202,575
Receivable from unconsolidated subsidiaries		204,790	204,790
Intangible asset		85,053	100,000
Investment in unconsolidated subsidiaries		11,876	5,032
Other assets	23,423	24,120	9,067	27,279
Total assets	2,256,559	2,748,213	2,794,539	6,006,604
Liabilities and shareholders' equity:
Accounts payable	24,223	14,941	12,147	14,161
Accrued expenses	27,924	25,744	62,094	56,817
Debtor-in-possession financing				50,000
Accrued interest	15,703	16,576	9,422	45,770
Deferred revenue, current	7,567			16,246
Total current liabilities			83,663	182,994
Long-term debt	1,073,734	1,039,335	1,035,641	969,158
Payable to Unconsolidated Subsidiaries		4,400	1,725
Other long-term liabilities	38,577	28,259	27,541	30,253
Total liabilities			1,148,570	1,182,405
Liabilities subject to compromise				3,084,874
Commitments and contingencies
Shareholders' equity:
Common Stock, Value, Issued	751	750	750	214
Additional Paid in Capital, Common Stock	1,652,681	1,645,692	1,645,219	2,368,232
Accumulated Other Comprehensive Income (Loss), Net of Tax				(13,850)
Retained Earnings (Accumulated Deficit)	(583,949)	(27,484)		(615,271)
Total stockholders' equity			1,645,969	1,739,325
Total liabilities and shareholders' equity	$ 2,256,559	$ 2,748,213	$ 2,794,539	6,006,604
Reorganization Adjustments
Assets:
Cash and cash equivalents				239,172
Restricted cash				(975,795)
Prepaid expenses and other current assets				(958)
Total current assets				(737,581)
Other assets				(1,356)
Total assets				(738,937)
Liabilities and shareholders' equity:
Accounts payable				1,247
Accrued expenses				11,264
Debtor-in-possession financing				(50,000)
Accrued interest				(36,348)
Total current liabilities				(73,837)
Other long-term liabilities				1,782
Total liabilities				(72,055)
Liabilities subject to compromise				(3,084,386)
Shareholders' equity:
Common Stock, Value, Issued				536
Additional Paid in Capital, Common Stock				1,646,097
Retained Earnings (Accumulated Deficit)				770,871
Total stockholders' equity				2,417,504
Total liabilities and shareholders' equity				(738,937)
Deconsolidation Of Zonda Debtors
Assets:
Cash and cash equivalents				(4,910)
Accounts receivable, net				(2)
Prepaid expenses and other current assets				(815)
Total current assets				(5,727)
Property and equipment, net				(68,102)
Long-term receivable				(202,575)
Receivable from unconsolidated subsidiaries				262,925
Investment in unconsolidated subsidiaries				5,774
Other assets				(1,845)
Total assets				(9,550)
Liabilities and shareholders' equity:
Accounts payable				(3,261)
Accrued expenses				(5,987)
Total current liabilities				(9,248)
Payable to Unconsolidated Subsidiaries				1,725
Other long-term liabilities				(1,539)
Total liabilities				(9,062)
Liabilities subject to compromise				(488)
Shareholders' equity:
Total liabilities and shareholders' equity				(9,550)
Fresh Start Accounting Adjustments
Assets:
Materials and supplies				(43,493)
Deferred costs, current				(11,371)
Prepaid expenses and other current assets				(693)
Total current assets				(55,557)
Property and equipment, net				(2,434,133)
Receivable from unconsolidated subsidiaries				(58,135)
Intangible asset				100,000
Investment in unconsolidated subsidiaries				(742)
Other assets				(15,011)
Total assets				(2,463,578)
Liabilities and shareholders' equity:
Deferred revenue, current				(16,246)
Total current liabilities				(16,246)
Long-term debt				66,483
Other long-term liabilities				(2,955)
Total liabilities				47,282
Shareholders' equity:
Additional Paid in Capital, Common Stock				(2,369,110)
Accumulated Other Comprehensive Income (Loss), Net of Tax				13,850
Retained Earnings (Accumulated Deficit)				(155,600)
Total stockholders' equity				(2,510,860)
Total liabilities and shareholders' equity				$ (2,463,578)