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Supplemental Disclosures to the Balance Sheets and Statements of Cash Flows - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Feb. 28, 2017
Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]          
Cash and cash equivalents $ 0 $ 68,680 $ 33,905 $ 32,049 $ 30,483
Restricted cash 0 0 34,833 52,860 197,793
Restricted cash in other noncurrent assets 0 0 0 125 128
Cash, cash equivalents and restricted cash $ 0 $ 68,680 $ 68,738 $ 85,034 $ 228,404