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Marketable Investments (Details 1) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Summary of available for sale securities at their contractual maturity date    
FY 2013, Total $ 39,559  
FY 2014, Total 58,116  
FY 2015, Total 22,933  
Thereafter, Total 8,926  
Total short and long term 129,534 143,846
State and municipal obligations [Member]
   
Summary of available for sale securities at their contractual maturity date    
FY 2013, Total 6,366  
FY 2014, Total 10,224  
FY 2015, Total 2,115  
Total short and long term 18,705 18,872
Federal agency and corporate obligations [Member]
   
Summary of available for sale securities at their contractual maturity date    
FY 2013, Total 33,193  
FY 2014, Total 47,892  
FY 2015, Total 20,818  
Total short and long term 101,903 116,004
ARS [Member]
   
Summary of available for sale securities at their contractual maturity date    
Thereafter, Total 8,926  
Total short and long term $ 8,926