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Supplemental Disclosures Supplemental Disclosures - Restricted Cash Reconciliation (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Supplemental Cash Flow Elements [Abstract]        
Cash $ 15,709 $ 64,545 $ 45,942  
Restricted cash 25,097 19,439 7,066  
Total cash and restricted cash $ 40,806 $ 83,984 $ 53,008 $ 102,482