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Summary of Significant Accounting Policies - Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Accounting Policies [Abstract]        
Cash $ 76,384 $ 77,671 $ 214,016  
Restricted cash 0   57,665  
Total cash and restricted cash shown in the condensed consolidated statement of cash flows $ 76,384 $ 77,671 $ 271,681 $ 263,453