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- Commitments and Contingencies - Restricted Cash (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]        
Cash and Cash Equivalents $ 425,152 $ 609,587 $ 439,855  
Restricted Cash included in Other Assets 9,287   17,769  
Total Cash, Cash Equivalents and Restricted Cash shown in the Statement of Cash Flows $ 434,439 $ 617,385 $ 457,624 $ 575,637