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- Schedule of Cash and Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Asset Retirement Obligation Disclosure [Abstract]    
Cash and cash equivalents $ 26,635 $ 12,810
Restricted cash included in other long-term assets 20,237 20,081
Total cash, cash equivalents and restricted cash $ 46,872 $ 32,891