Annual report pursuant to Section 13 and 15(d)

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)

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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
Dec. 31, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments $ (7,368) $ (485)
Less Than 12 Months, Fair Value 327,939 119,453
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses Accumulated In Investments (1,577) (2)
12 Months or More, Fair Value 33,900 201
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 Than 12 Months Aggregate Losses Accumulated In Investments (6,188) (219)
Less Than 12 Months, Fair Value 172,365 56,033
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses Accumulated In Investments (1,307) (2)
12 Months or More, Fair Value 26,454 201
Corporate Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments (400) (195)
Less Than 12 Months, Fair Value 52,725 44,208
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses Accumulated In Investments (207) 0
12 Months or More, Fair Value 5,020 0
Municipal Securities, General Obligation [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments (72) (26)
Less Than 12 Months, Fair Value 3,480 7,930
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses Accumulated In Investments (63) 0
12 Months or More, Fair Value 2,426 0
Municipal Securities, Revenue [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments (292) (30)
Less Than 12 Months, Fair Value 27,789 3,090
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
Asset Backed Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments (333) (15)
Less Than 12 Months, Fair Value 37,689 8,192
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
Mortgage backed securities
   
Schedule of Available-for-sale Securities [Line Items]    
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments (83) 0
Less Than 12 Months, Fair Value 33,891 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