Parent and Subsidiary Guarantor - Condensed Consolidating Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Assets:
Cash and cash equivalents	$ 16,449	$ 32,774	$ 314,466	$ 275,841
Accounts receivable, net of allowance for doubtful accounts	62,120	72,943
Other current assets	7,868	84,064
Property and equipment, net	2,064,174	2,029,523
Intercompany receivable	0
Investment in subsidiaries	0	0
Noncurrent assets	5,441	33,156
Total	2,156,052	2,252,460
Liabilities and Stockholders' Equity:
Accounts payable and accrued liabilities	71,638	131,379
Other current liabilities	103,840	116,806
Intercompany payable	0
Long-term debt, net of debt issuance costs	758,911	617,387
Deferred income taxes	97,418	139,534
Other noncurrent liabilities	40,927	35,256
Stockholders' equity	1,083,318	1,212,098	598,554	571,543
Total	2,156,052	2,252,460
Reportable Legal Entities | Parent Guarantor
Assets:
Cash and cash equivalents	0	0	0
Accounts receivable, net of allowance for doubtful accounts	0	0
Other current assets	0	0
Property and equipment, net	0	0
Intercompany receivable	0
Investment in subsidiaries	1,083,318	1,212,098
Noncurrent assets	0	0
Total	1,083,318	1,212,098
Liabilities and Stockholders' Equity:
Accounts payable and accrued liabilities	0	0
Other current liabilities	0	0
Intercompany payable	0
Long-term debt, net of debt issuance costs	0	0
Deferred income taxes	0	0
Other noncurrent liabilities	0	0
Stockholders' equity	1,083,318	1,212,098
Total	1,083,318	1,212,098
Reportable Legal Entities | Subsidiary Issuer
Assets:
Cash and cash equivalents	16,449	32,774	314,466
Accounts receivable, net of allowance for doubtful accounts	62,098	72,943
Other current assets	7,868	84,064
Property and equipment, net	2,063,798	2,029,523
Intercompany receivable	363
Investment in subsidiaries	34	0
Noncurrent assets	5,441	33,156
Total	2,156,051	2,252,460
Liabilities and Stockholders' Equity:
Accounts payable and accrued liabilities	71,638	131,379
Other current liabilities	103,839	116,806
Intercompany payable	0
Long-term debt, net of debt issuance costs	758,911	617,387
Deferred income taxes	97,418	139,534
Other noncurrent liabilities	40,927	35,256
Stockholders' equity	1,083,318	1,212,098
Total	2,156,051	2,252,460
Reportable Legal Entities | Guarantor Subsidiaries
Assets:
Cash and cash equivalents	0	0	0	0
Accounts receivable, net of allowance for doubtful accounts	22
Other current assets	0
Property and equipment, net	376
Intercompany receivable	0
Investment in subsidiaries	0
Noncurrent assets	0
Total	398
Liabilities and Stockholders' Equity:
Accounts payable and accrued liabilities	0
Other current liabilities	1
Intercompany payable	363
Long-term debt, net of debt issuance costs	0
Deferred income taxes	0
Other noncurrent liabilities	0
Stockholders' equity	34
Total	398
Intercompany Eliminations
Assets:
Cash and cash equivalents	0	0	$ 0	$ 0
Accounts receivable, net of allowance for doubtful accounts	0	0
Other current assets	0	0
Property and equipment, net	0	0
Intercompany receivable	(363)
Investment in subsidiaries	(1,083,352)	(1,212,098)
Noncurrent assets	0	0
Total	(1,083,715)	(1,212,098)
Liabilities and Stockholders' Equity:
Accounts payable and accrued liabilities	0	0
Other current liabilities	0	0
Intercompany payable	(363)
Long-term debt, net of debt issuance costs	0	0
Deferred income taxes	0	0
Other noncurrent liabilities	0	0
Stockholders' equity	(1,083,352)	(1,212,098)
Total	$ (1,083,715)	$ (1,212,098)