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- Schedule of Cash and Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Asset Retirement Obligation Disclosure [Abstract]    
Cash and cash equivalents $ 14,728 $ 14,640
Restricted cash included in other long-term assets 20,054 19,652
Total cash, cash equivalents and restricted cash $ 34,782 $ 34,292