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Marketable Investments (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Available-for-sale securities    
Amortized Cost $ 131,249 $ 145,512
Gross Unrealized Gains 374 407
Gross Unrealized Losses (2,089) (2,073)
Total short and long term 129,534 143,846
State and municipal obligations [Member]
   
Available-for-sale securities    
Amortized Cost 18,669 18,859
Gross Unrealized Gains 36 27
Gross Unrealized Losses   (14)
Total short and long term 18,705 18,872
Federal agency and corporate obligations [Member]
   
Available-for-sale securities    
Amortized Cost 101,580 115,653
Gross Unrealized Gains 338 380
Gross Unrealized Losses (15) (29)
Total short and long term 101,903 116,004
Total short-term available-for-sale securities [Member]
   
Available-for-sale securities    
Amortized Cost 120,249 134,512
Gross Unrealized Gains 374 407
Gross Unrealized Losses (15) (43)
Total short and long term 120,608 134,876
ARS, long-term [Member]
   
Available-for-sale securities    
Amortized Cost 11,000 11,000
Gross Unrealized Gains      
Gross Unrealized Losses (2,074) (2,030)
Total short and long term $ 8,926 $ 8,970