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Quarterly Results of Operations (Unaudited) - Summary of Stockholders Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Quarterly Financial Information [Line Items]                          
Beginning Balance $ 767,681 $ 742,760 $ 696,324 $ 724,968       $ 849,781 $ 724,968 $ 724,968 $ 724,968 $ 849,781 $ 1,127,870
Consolidated net income (loss) (12,744) 9,904 39,273 20,169 $ (33,475) $ (1,553) $ 22,307 84,974 59,442 69,346 56,602 72,253 286,610
Ending Balance 808,229 767,681 742,760 696,324 724,968       742,760 767,681 808,229 724,968 849,781
As Reported [Member]                          
Quarterly Financial Information [Line Items]                          
Beginning Balance 802,625 762,678 715,956 743,737       863,174 743,737 743,737 743,737 863,174 1,139,741
Consolidated net income (loss)   24,930 39,559 21,032 (26,556) 2,560 21,765 87,174 60,591 85,521   84,943 279,866
Ending Balance   802,625 762,678 715,956 743,737       762,678 802,625   743,737 863,174
Adjustments [Member]                          
Quarterly Financial Information [Line Items]                          
Beginning Balance       (18,769)       (13,393) (18,769) (18,769) (18,769) (13,393) (11,871)
Consolidated net income (loss)                       (12,690) 6,744
Ending Balance         (18,769)             (18,769) (13,393)
Adjustments [Member]                          
Quarterly Financial Information [Line Items]                          
Beginning Balance (34,944) (19,918) (19,632) (18,769)         (18,769) (18,769) (18,769)    
Consolidated net income (loss)   (15,026) (286) (863) (6,919) $ (4,113) $ 542 (2,200) (1,149) (16,175)      
Ending Balance   (34,944) (19,918) (19,632) (18,769)       (19,918) (34,944)   (18,769)  
Additional Paid-in Capital [Member]                          
Quarterly Financial Information [Line Items]                          
Beginning Balance 2,317,862 2,309,129 2,293,221 2,272,103       2,203,453 2,272,103 2,272,103 2,272,103 2,203,453 1,764,013
Ending Balance 2,354,492 2,317,862 2,309,129 2,293,221 2,272,103       2,309,129 2,317,862 2,354,492 2,272,103 2,203,453
Additional Paid-in Capital [Member] | As Reported [Member]                          
Quarterly Financial Information [Line Items]                          
Beginning Balance 2,317,706 2,308,973 2,293,065 2,271,947       2,208,221 2,271,947 2,271,947 2,271,947 2,208,221 1,763,371
Ending Balance   2,317,706 2,308,973 2,293,065 2,271,947       2,308,973 2,317,706   2,271,947 2,208,221
Additional Paid-in Capital [Member] | Adjustments [Member]                          
Quarterly Financial Information [Line Items]                          
Beginning Balance 156 156 156 156       (4,768) 156 156 156 (4,768) 642
Ending Balance   156 156 156 156       156 156   156 (4,768)
Retained Deficit [Member]                          
Quarterly Financial Information [Line Items]                          
Beginning Balance (1,259,540) (1,265,589) (1,289,931) (1,253,089)       (1,108,209) (1,253,089) (1,253,089) (1,253,089) (1,108,209) (866,875)
Consolidated net income (loss)   9,653 27,919 13,674         41,593 51,246 48,908 47,562 202,196
Ending Balance (1,265,504) (1,259,540) (1,265,589) (1,289,931) (1,253,089)       (1,265,589) (1,259,540) (1,265,504) (1,253,089) (1,108,209)
Retained Deficit [Member] | As Reported [Member]                          
Quarterly Financial Information [Line Items]                          
Beginning Balance (1,237,657) (1,253,434) (1,277,956) (1,241,754)       (1,105,019) (1,241,754) (1,241,754) (1,241,754) (1,105,019) (859,009)
Consolidated net income (loss)   19,381 28,099 14,314         42,413 61,794   55,707 197,520
Ending Balance   (1,237,657) (1,253,434) (1,277,956) (1,241,754)       (1,253,434) (1,237,657)   (1,241,754) (1,105,019)
Retained Deficit [Member] | Adjustments [Member]                          
Quarterly Financial Information [Line Items]                          
Beginning Balance       (11,335)       (3,190) (11,335) (11,335) (11,335) (3,190) (7,866)
Consolidated net income (loss)                       (8,145) 4,676
Ending Balance         (11,335)             (11,335) (3,190)
Retained Deficit [Member] | Adjustments [Member]                          
Quarterly Financial Information [Line Items]                          
Beginning Balance (21,883) (12,155) (11,975) (11,335)         (11,335) (11,335) (11,335)    
Consolidated net income (loss)   (9,728) (180) (640)         (820) (10,548)      
Ending Balance   (21,883) (12,155) (11,975) (11,335)       (12,155) (21,883)   (11,335)  
Noncontrolling Interest in Subsidiaries [Member]                          
Quarterly Financial Information [Line Items]                          
Beginning Balance 59,960 57,001 48,349 50,321       89,366 50,321 50,321 50,321 89,366 501,208
Consolidated net income (loss)   251 11,354 6,495         17,849 18,100 7,694 24,691 84,414
Ending Balance 59,290 59,960 57,001 48,349 50,321       57,001 59,960 59,290 50,321 89,366
Noncontrolling Interest in Subsidiaries [Member] | As Reported [Member]                          
Quarterly Financial Information [Line Items]                          
Beginning Balance 73,177 64,920 56,162 57,911       94,801 57,911 57,911 57,911 94,801 505,855
Consolidated net income (loss)   5,549 11,460 6,718         18,178 23,727   29,236 82,346
Ending Balance   73,177 64,920 56,162 57,911       64,920 73,177   57,911 94,801
Noncontrolling Interest in Subsidiaries [Member] | Adjustments [Member]                          
Quarterly Financial Information [Line Items]                          
Beginning Balance       (7,590)       $ (5,435) (7,590) (7,590) (7,590) (5,435) (4,647)
Consolidated net income (loss)                       (4,545) 2,068
Ending Balance         (7,590)             (7,590) $ (5,435)
Noncontrolling Interest in Subsidiaries [Member] | Adjustments [Member]                          
Quarterly Financial Information [Line Items]                          
Beginning Balance $ (13,217) (7,919) (7,813) (7,590)         (7,590) (7,590) $ (7,590)    
Consolidated net income (loss)   (5,298) (106) (223)         (329) (5,627)      
Ending Balance   $ (13,217) $ (7,919) $ (7,813) $ (7,590)       $ (7,919) $ (13,217)   $ (7,590)