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Marketable Securities (Summary of Available-for-Sale Securities Held) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis $ 345,714 $ 690,278
Available-For-Sale Debt Securities Gross Unrealized Gain, Accumulated In AOCI 883 24
Available-For-Sale Debt Securities Gross Unrealized Loss, Accumulated In AOCI 51 997
Available-for-sale Securities, Debt Securities 346,546 689,305
Commercial Paper [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 3,999 254,396
Available-For-Sale Debt Securities Gross Unrealized Gain, Accumulated In AOCI 0 0
Available-For-Sale Debt Securities Gross Unrealized Loss, Accumulated In AOCI 0 0
Available-for-sale Securities, Debt Securities 3,999 254,396
Corporate Bond Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 136,009 133,062
Available-For-Sale Debt Securities Gross Unrealized Gain, Accumulated In AOCI 553 23
Available-For-Sale Debt Securities Gross Unrealized Loss, Accumulated In AOCI 3 336
Available-for-sale Securities, Debt Securities 136,559 132,749
Municipal Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 50,470 87,173
Available-For-Sale Debt Securities Gross Unrealized Gain, Accumulated In AOCI 43 1
Available-For-Sale Debt Securities Gross Unrealized Loss, Accumulated In AOCI 2 63
Available-for-sale Securities, Debt Securities 50,511 87,111
US Government Agencies Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 13,643 25,244
Available-For-Sale Debt Securities Gross Unrealized Gain, Accumulated In AOCI 43 0
Available-For-Sale Debt Securities Gross Unrealized Loss, Accumulated In AOCI 27 94
Available-for-sale Securities, Debt Securities 13,659 25,150
Foreign Government Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 141,593 163,403
Available-For-Sale Debt Securities Gross Unrealized Gain, Accumulated In AOCI 244 0
Available-For-Sale Debt Securities Gross Unrealized Loss, Accumulated In AOCI 19 504
Available-for-sale Securities, Debt Securities $ 141,818 162,899
Certificates of Deposit [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis   27,000
Available-For-Sale Debt Securities Gross Unrealized Gain, Accumulated In AOCI   0
Available-For-Sale Debt Securities Gross Unrealized Loss, Accumulated In AOCI   0
Available-for-sale Securities, Debt Securities   $ 27,000