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- Commitments and Contingencies - Restricted Cash (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]        
Cash and Cash Equivalents $ 790,590 $ 609,587 $ 558,524  
Restricted Cash included in Other Assets 9,506 7,798 17,113  
Total Cash, Cash Equivalents and Restricted Cash shown in the Statement of Cash Flows $ 800,096 $ 617,385 $ 575,637 $ 463,257