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Investments and Fair Value Measurements (Details) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Dec. 31, 2012
Cash, cash equivalents and investments [Abstract]            
Cash $ 26,151,000   $ 26,151,000   $ 24,852,000  
Cash Equivalents, at Carrying Value [Abstract]            
Money market funds 156,000   156,000   109,000  
Cash Equivalents, at Carrying Value, Total 26,307,000 21,959,000 26,307,000 21,959,000 24,961,000 30,634,000
Amortized Cost 47,591,000   47,591,000   45,682,000  
Gross Unrealized Gain 1,774,000   1,774,000   1,933,000  
Gross Unrealized (Loss) (2,000)   (2,000)   (10,000)  
Fair Value 49,363,000   49,363,000   47,605,000  
Contractual maturities on investments, amortized cost basis [Abstract]            
Due within 1 year 20,324,000   20,324,000   10,569,000  
Due after 1 through 5 years 960,000   960,000   10,152,000  
Investments, amortized cost 21,284,000   21,284,000   20,721,000  
Contractual maturities on investments, fair value basis [Abstract]            
Due within 1 year 22,097,000   22,097,000   12,499,000  
Due after 1 through 5 years 959,000   959,000   10,145,000  
Investments, fair value 23,056,000   23,056,000   22,644,000  
Proceeds from sales of available-for-sale investments 346,000 0 346,000 0    
Gross realized gains from sales of available-for-sale investments 324,000 0 324,000 0    
Gain on sale of available for sale security     800,000      
Unrealized gain, net of tax     1,800,000      
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract]            
Fair value, in loss position less than twelve months 719,000   719,000   7,898,000  
Gross unrealized loss, in loss position less than twelve months     (1,000)   (9,000)  
Fair value, in loss position greater than twelve months 2,432,000   2,432,000   4,431,000  
Gross unrealized loss, in loss position greater than twelve months     (1,000)   (1,000)  
Fair value, total in loss position 3,151,000   3,151,000   12,329,000  
Gross unrealized loss, total in loss position     (2,000)   (10,000)  
Minority Investments [Abstract]            
Minority investments in unconsolidated privately-held companies 200,000   200,000   200,000  
Other assets [Member]
            
Minority Investments [Abstract]            
Investments in privately-held companies 11,700,000   11,700,000   10,900,000  
Minority investments in unconsolidated privately-held companies 200,000   200,000   200,000  
Certificates of deposit [Member]
            
Cash Equivalents, at Carrying Value [Abstract]            
Amortized Cost 7,148,000   7,148,000   6,320,000  
Gross Unrealized Gain 1,000   1,000   2,000  
Gross Unrealized (Loss) (1,000)   (1,000)   (4,000)  
Fair Value 7,148,000   7,148,000   6,318,000  
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract]            
Fair value, in loss position less than twelve months 719,000   719,000   3,425,000  
Gross unrealized loss, in loss position less than twelve months     (1,000)   (4,000)  
Fair value, in loss position greater than twelve months 730,000   730,000   720,000  
Gross unrealized loss, in loss position greater than twelve months     0   0  
Fair value, total in loss position 1,449,000   1,449,000   4,145,000  
Gross unrealized loss, total in loss position     (1,000)   (4,000)  
Corporate bonds [Member]
            
Cash Equivalents, at Carrying Value [Abstract]            
Amortized Cost 14,032,000   14,032,000   14,276,000  
Gross Unrealized Gain 8,000   8,000   8,000  
Gross Unrealized (Loss) (1,000)   (1,000)   (6,000)  
Fair Value 14,039,000   14,039,000   14,278,000  
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract]            
Fair value, in loss position less than twelve months 0   0   4,473,000  
Gross unrealized loss, in loss position less than twelve months     0   (5,000)  
Fair value, in loss position greater than twelve months 1,702,000   1,702,000   3,711,000  
Gross unrealized loss, in loss position greater than twelve months     (1,000)   (1,000)  
Fair value, total in loss position 1,702,000   1,702,000   8,184,000  
Gross unrealized loss, total in loss position     (1,000)   (6,000)  
Corporate equity security [Member]
            
Cash Equivalents, at Carrying Value [Abstract]            
Amortized Cost 104,000   104,000   125,000  
Gross Unrealized Gain 1,765,000   1,765,000   1,923,000  
Gross Unrealized (Loss) 0   0   0  
Fair Value 1,869,000   1,869,000   2,048,000  
Total Investments [Member]
            
Cash Equivalents, at Carrying Value [Abstract]            
Amortized Cost 21,284,000   21,284,000   20,721,000  
Gross Unrealized Gain 1,774,000   1,774,000   1,933,000  
Gross Unrealized (Loss) (2,000)   (2,000)   (10,000)  
Fair Value $ 23,056,000   $ 23,056,000   $ 22,644,000