Quarterly report pursuant to Section 13 or 15(d)

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

v3.10.0.1
Summary of Significant Accounting Policies - Cash and Restricted Cash (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Accounting Policies [Abstract]        
Cash $ 242,936 $ 202,525    
Restricted cash, current and long-term 32,197 39,265    
Total Cash and Restricted Cash $ 275,133 $ 241,790 $ 236,130 $ 224,363