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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

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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