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Basis of Presentation and Significant Accounting Policies - Reconciliation of Cash and Cash Equivalents and Restricted Cash and Cash Equivalents (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Accounting Policies [Abstract]        
Cash and cash equivalents $ 317,624 $ 203,404    
Restricted cash and cash equivalents 5,870 7,105    
Restricted cash and cash equivalents included in Other Assets 2,647 2,635    
Total cash and cash equivalents and restricted cash and cash equivalents as presented in our condensed consolidated statement of cash flows $ 326,141 $ 213,144 $ 157,930 $ 134,600