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Cash, Cash Equivalents, And Marketable Securities (Cash, Cash Equivalents, And Marketable Securities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]        
Cash $ 39,183 $ 99,027    
Money market funds 134,790 137,593    
Time deposits 4,632 4,007    
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value 1,626,764 1,685,882    
Available-for-sale Securities, Equity Securities 2,174 890    
Total 1,807,543 1,927,399    
Included in Cash and cash equivalents 231,945 228,659 $ 191,608 $ 339,223
Included in Marketable securities 1,565,962 1,686,771    
Included in Other assets (Restricted cash) $ 9,636 $ 11,969