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Investments and Fair Value Measurements (Gains (Losses) on Investments) (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Available-for-sale:      
Available-for-sale securities, Cost $ 108,040   $ 124,557
Available-for-sale Securities, Unrealized Gain 2,372   2,517
Available-for-sale Securities, Unrealized Loss (725)   (1,288)
Available-for-sale securities, Fair Value 109,687   125,786
Held-to-maturity:      
Held-to-maturity securities, Cost 28,343   26,357
Held-to-maturity Securities, Unrecognized Gain 0   0
Held-to-maturity Securities, Unrecognized Loss 0   0
Held-to-maturity securities, Fair Value 28,343   26,357
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]      
Available-for-sale securities, realized gains 2,226 470  
Available-for-sale securities, realized losses (1,078) (519)  
Available-for-sale securities, realized gains (losses), net 1,148 (49)  
Government Obligations [Member]
     
Available-for-sale:      
Available-for-sale securities, Cost 25,277   40,669
Available-for-sale Securities, Unrealized Gain 11   29
Available-for-sale Securities, Unrealized Loss (61)   (608)
Available-for-sale securities, Fair Value 25,227   40,090
Corporate Bonds [Member]
     
Available-for-sale:      
Available-for-sale securities, Cost 54,189   49,339
Available-for-sale Securities, Unrealized Gain 8   36
Available-for-sale Securities, Unrealized Loss (302)   (292)
Available-for-sale securities, Fair Value 53,895   49,083
Foreign Government Debt Securities [Member]
     
Available-for-sale:      
Available-for-sale securities, Cost 2,437   2,437
Available-for-sale Securities, Unrealized Gain 0   1
Available-for-sale Securities, Unrealized Loss (41)   (19)
Available-for-sale securities, Fair Value 2,396   2,419
Commercial Paper [Member]
     
Available-for-sale:      
Available-for-sale securities, Cost 7,484   2,000
Available-for-sale Securities, Unrealized Gain 0   0
Available-for-sale Securities, Unrealized Loss (2)   0
Available-for-sale securities, Fair Value 7,482   2,000
Equity Securities and Exchange-traded Funds [Member]
     
Available-for-sale:      
Available-for-sale securities, Cost 8,038   19,613
Available-for-sale Securities, Unrealized Gain 515   1,359
Available-for-sale Securities, Unrealized Loss (220)   (323)
Available-for-sale securities, Fair Value 8,333   20,649
Mutual Funds [Member]
     
Available-for-sale:      
Available-for-sale securities, Cost 10,615   10,499
Available-for-sale Securities, Unrealized Gain 1,838   1,092
Available-for-sale Securities, Unrealized Loss (99)   (46)
Available-for-sale securities, Fair Value $ 12,354   $ 11,545