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Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Cash and Cash Equivalents [Abstract]        
Lease agreement term (in years) 1 year      
Balance Sheet        
Cash and cash equivalents $ 67,325 $ 118,799 $ 270,369  
Restricted cash 128,524 131,442 133,996 $ 111,300
Statement of Cash Flows        
Cash, cash equivalents and restricted cash $ 195,849 $ 250,241 $ 404,365 $ 168,968