v2.4.0.8
Short-Term And Long-Term Investments And Restricted Deposits (Fair Value Of Available-For-Sale Investments With Gross Unrealized Losses By Investment Type And Length Of Time) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses Accumulated In Investments $ (1,278) $ (7,368)
Less Than 12 Months, Fair Value 303,226 327,939
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses Accumulated In Investments (4,216) (1,577)
12 Months or More, Fair Value 196,150 33,900
U.S. Treasury Securities And Obligations Of U.S. Government Corporations And Agencies [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses Accumulated In Investments (204) (6,188)
Less Than 12 Months, Fair Value 62,910 172,365
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses Accumulated In Investments (4,069) (1,307)
12 Months or More, Fair Value 178,270 26,454
Corporate Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses Accumulated In Investments (972) (400)
Less Than 12 Months, Fair Value 195,027 52,725
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses Accumulated In Investments (18) (207)
12 Months or More, Fair Value 983 5,020
Municipal Securities, General Obligation [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses Accumulated In Investments 0 (72)
Less Than 12 Months, Fair Value 0 3,480
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses Accumulated In Investments (14) (63)
12 Months or More, Fair Value 3,456 2,426
Municipal Securities, Pre-Refunded [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses Accumulated In Investments (16) 0
Less Than 12 Months, Fair Value 1,022 0
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses Accumulated In Investments 0 0
12 Months or More, Fair Value 0 0
Municipal Securities, Revenue [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses Accumulated In Investments (24) (292)
Less Than 12 Months, Fair Value 2,356 27,789
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses Accumulated In Investments (34) 0
12 Months or More, Fair Value 3,395 0
Asset Backed Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses Accumulated In Investments (62) (333)
Less Than 12 Months, Fair Value 41,911 37,689
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses Accumulated In Investments (81) 0
12 Months or More, Fair Value 10,046 0
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses Accumulated In Investments 0 (83)
Less Than 12 Months, Fair Value 0 33,891
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses Accumulated In Investments 0 0
12 Months or More, Fair Value $ 0 $ 0