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Financial Instruments (Details) (USD $)
9 Months Ended 9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2013
Level 1
Dec. 31, 2012
Level 1
Sep. 30, 2013
Investments
Level 3
Dec. 31, 2012
Investments
Level 3
Sep. 30, 2013
Investments
Level 3
Market comparable companies
Minimum
Sep. 30, 2013
Investments
Level 3
Market comparable companies
Maximum
Sep. 30, 2013
Investments
Level 3
Market comparable companies
Weighted average
Sep. 30, 2013
Investment in FATV
Dec. 31, 2012
Investment in FATV
Sep. 30, 2013
Investment in FATV
Level 3
item
Disclosure About Significant Unobservable Inputs                        
Cash equivalents     $ 3,300,000 $ 3,100,000                
Remaining financial instruments owned related to legacy deferred compensation plans     900,000                  
Investments $ 17,884,000 $ 20,478,000     $ 17,900,000 $ 20,478,000       $ 14,918,000 $ 17,110,000 $ 14,900,000
Number of privately held companies                       6
Enterprise value/Revenue multiple             2.7 6.7 5.4      
Discount rate (as a percent)             30.00% 35.00% 31.00%