Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Cash, Cash Equivalents and Restricted Cash (Details)

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Summary of Significant Accounting Policies - Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Summary of Significant Accounting Policies        
Cash and cash equivalents $ 145,326 $ 158,779    
Restricted cash 4,232 4,017    
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows $ 149,558 $ 162,796 $ 144,586 $ 198,771