Condensed Parent Company Financial Statements - Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 149,027	$ 224,502	$ 173,515
Prepaid expenses and other	27,870	36,192
Total current assets	400,291	566,557
Deferred financing costs, net of accumulated amortization of $17,296 and $14,681 at December 31, 2020 and December 31, 2019, respectively	3,706	6,321
Restricted cash	542	542	7,574
Long-term deferred tax asset	0	32,779
Total assets	3,867,593	4,317,232	4,088,189
Current liabilities:
Accounts payable	221,430	149,483
Accrued liabilities	203,260	380,704
Derivatives	28,009	8,914
Total current liabilities	460,199	539,101
Long-term debt, net	2,103,931	2,008,063
Derivatives	8,069	11,478
Other long-term liabilities	37,455	33,141
Stockholders’ equity:
Preference shares, $0.01 par value; 200,000,000 authorized shares; zero issued at December 31, 2020 and December 31, 2019	0	0
Common stock, $0.01 par value; 2,000,000,000 authorized shares; 449,718,317 and 445,779,367 issued at December 31, 2020 and December 31, 2019, respectively	4,497	4,458
Additional paid-in capital	2,307,220	2,297,221
Accumulated deficit	(1,634,556)	(1,222,970)
Treasury stock, at cost, 44,263,269 shares at December 31, 2020 and December 31, 2019, respectively	(237,007)	(237,007)
Total stockholders’ equity	440,154	841,702	$ 941,478	$ 897,112
Total liabilities and stockholders’ equity	3,867,593	4,317,232
Parent Company
Current assets:
Cash and cash equivalents	1,166	6,422
Receivables from subsidiaries	0	3,819
Prepaid expenses and other	908	428
Derivatives—related party	2,502	0
Total current assets	4,576	10,669
Investment in subsidiaries at equity	1,034,226	1,159,560
Long-term note receivable from subsidiary	176,540	518,844
Deferred financing costs, net of accumulated amortization of $17,296 and $14,681 at December 31, 2020 and December 31, 2019, respectively	3,706	6,321
Derivatives—related party	140	0
Restricted cash	305	305
Long-term deferred tax asset	18,687	17,265
Total assets	1,238,180	1,712,964
Current liabilities:
Accounts payable	153	0
Accounts payable to subsidiaries	38,558	0
Accrued liabilities	14,157	11,942
Derivatives	2,502	0
Total current liabilities	55,370	11,942
Long-term debt, net	741,606	640,856
Long-term note payable to subsidiary	0	217,000
Derivatives	140	0
Other long-term liabilities	910	1,464
Stockholders’ equity:
Preference shares, $0.01 par value; 200,000,000 authorized shares; zero issued at December 31, 2020 and December 31, 2019	0	0
Common stock, $0.01 par value; 2,000,000,000 authorized shares; 449,718,317 and 445,779,367 issued at December 31, 2020 and December 31, 2019, respectively	4,497	4,458
Additional paid-in capital	2,307,220	2,297,221
Accumulated deficit	(1,634,556)	(1,222,970)
Treasury stock, at cost, 44,263,269 shares at December 31, 2020 and December 31, 2019, respectively	(237,007)	(237,007)
Total stockholders’ equity	440,154	841,702
Total liabilities and stockholders’ equity	$ 1,238,180	$ 1,712,964