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Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Reconciliation of Cash, Cash Equivalents and Restricted Cash and Cash Equivalents (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounting Policies [Abstract]        
Cash and cash equivalents $ 78,922 $ 83,015 $ 53,551 $ 17,753
Restricted cash 22,358 25,177 18,010 17,083
Total cash and cash equivalents and restricted cash $ 101,280 $ 108,192 $ 71,561 $ 34,836