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Cash Flow Reconciliation (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Net cash provided by operating activities $ 239,604 $ 200,852    
Cash and cash equivalents 87,723 89,354 $ 83,015 $ 53,551
Restricted cash 25,784 22,103 25,177 18,010
Total $ 113,507 111,457 $ 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   $ 4,100