Cash, Cash Equivalents, And Marketable Securities (Cash, Cash Equivalents, And Marketable Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Cash	$ 99,027	$ 110,799
Money market funds	137,593	85,453
Time deposits	4,007	3,384
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	1,685,882	1,233,076
Available-for-sale Securities, Equity Securities	890	0
Total	1,927,399	1,432,712
Included in Cash and cash equivalents	228,659	191,608	$ 339,223	$ 130,736
Included in Marketable securities	1,686,771	1,233,076
Included in Other assets (Restricted cash)	$ 11,969	$ 8,028