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Summary Of Significant Accounting Policies - Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Cash, Cash Equivalents, and Restricted Cash        
Cash and cash equivalents $ 111,701 $ 146,630 $ 86,542  
Restricted cash included in "Restricted cash and other non-current assets" 1,619   1,619  
Total $ 113,320 $ 148,249 $ 88,161 $ 186,942