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Cash Flow Reconciliation (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Net cash provided by operating activities $ 141,036 $ 108,867    
Cash and cash equivalents 73,242 337,400 $ 83,015 $ 53,551
Restricted cash 17,284 19,166 25,177 18,010
Total $ 90,526 356,566 $ 108,192 $ 71,561
Accounting Standards Update 2016-18        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Net cash provided by operating activities   $ 1,200