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Stockholders' Equity (Deficit) - Changes by Component (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance $ 1,541,472 $ 1,814,789 $ 1,078,350
Cumulative credit risk adjustment 0 0 (9,211)
Ending balance (737,317) 1,541,472 1,814,789
(Loss) gain on extinguishment of debt (4,601) (12,437) 104
Accumulated Other Comprehensive Income (Loss)      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (1,679) (1,950) (1,845)
Cumulative credit risk adjustment     (9,211)
Change in net unrealized gain (loss) 5,283 271 4,783
Amounts reclassified to net income     4,323
Other comprehensive income (loss) 5,283 271 9,106
Ending balance 3,604 (1,679) (1,950)
Foreign currency translation      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (1,679) (1,950) (553)
Cumulative credit risk adjustment     0
Change in net unrealized gain (loss) 5,283 271 (1,397)
Amounts reclassified to net income     0
Other comprehensive income (loss) 5,283 271 (1,397)
Ending balance 3,604 (1,679) (1,950)
Unrealized loss on investment securities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 0 0 (1,292)
Cumulative credit risk adjustment     0
Change in net unrealized gain (loss) 0 0 (1,510)
Amounts reclassified to net income     2,802
Other comprehensive income (loss) 0 0 1,292
Ending balance 0 0 0
Other-than-temporary impairment losses     1,800
Realized losses on investments     1,000
(Loss) gain on extinguishment of debt     1,500
Redemption Note      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 0 0 0
Cumulative credit risk adjustment     (9,211)
Change in net unrealized gain (loss) 0 0 7,690
Amounts reclassified to net income     1,521
Other comprehensive income (loss) 0 0 9,211
Ending balance $ 0 $ 0 $ 0