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Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Cash and Cash Equivalents [Abstract]        
Cash and cash equivalents $ 157,204 $ 186,212    
Restricted Cash 1,251 0    
Total cash, cash equivalents and restricted cash shown in the statements of cash flows $ 158,455 $ 186,212 $ 178,764 $ 213,015