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Investments and Fair Value Measurements (Details) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Cash, cash equivalents and investments [Abstract]          
Cash $ 21,957,000 $ 21,957,000   $ 26,250,000  
Cash Equivalents, at Carrying Value [Abstract]          
Money market funds 2,000 2,000   4,384,000  
Cash Equivalents, at Carrying Value, Total 2,000 2,000   4,384,000  
Cash and Cash Equivalents, at Carrying Value, Total 21,959,000 21,959,000 31,281,000 30,634,000 [1] 26,156,000
Amortized Cost 45,522,000 45,522,000   50,144,000  
Gross Unrealized Gain   9,000   16,000  
Gross Unrealized (Loss)   (105,000)   (65,000)  
Fair Value 45,426,000 45,426,000   50,095,000  
Contractual maturities on investments, amortized cost basis [Abstract]          
Due within 1 year 6,578,000 6,578,000   10,288,000  
Due after 1 through 5 years 16,985,000 16,985,000   9,222,000  
Investments, amortized cost 23,563,000 23,563,000   19,510,000  
Contractual maturities on investments, fair value basis [Abstract]          
Due within 1 year 6,581,000 6,581,000   10,270,000  
Due after 1 through 5 years 16,886,000 16,886,000   9,191,000  
Investments, fair value 23,467,000 23,467,000   19,461,000  
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract]          
Fair value, in loss position less than twelve months 16,088,000 16,088,000   8,323,000  
Gross unrealized loss, in loss position less than twelve months   (105,000)   (41,000)  
Fair value, in loss position greater than twelve months 0 0   1,701,000  
Gross unrealized loss, in loss position greater than twelve months   0   (24,000)  
Fair value, total in loss position 16,088,000 16,088,000   10,024,000  
Gross unrealized loss, total in loss position   (105,000)   (65,000)  
Minority Investments [Abstract]          
Percentage of option exercised to sell shares (in hundredths) 35.00%        
Gain recognized in other income (expense) 811,000 811,000 0    
Minority investments in unconsolidated privately-held companies 325,000 325,000   392,000  
Assets [Abstract]          
Cash and Cash Equivalents, Fair Value Disclosure 21,959,000 21,959,000   30,634,000  
Recurring [Member]
          
Assets [Abstract]          
Assets, fair value 23,469,000 23,469,000   23,845,000  
Liabilities [Abstract]          
Liabilities, fair value 0 0   0  
Recurring [Member] | Quoted Prices in Active Markets of Identical Assets (Level 1) [Member]
          
Assets [Abstract]          
Assets, fair value 2,000 2,000   4,384,000  
Liabilities [Abstract]          
Liabilities, fair value 0 0   0  
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
          
Assets [Abstract]          
Assets, fair value 23,467,000 23,467,000   19,461,000  
Liabilities [Abstract]          
Liabilities, fair value 0 0   0  
Recurring [Member] | Money market fund - cash [Member]
          
Assets [Abstract]          
Cash and Cash Equivalents, Fair Value Disclosure 2,000 2,000   4,384,000  
Recurring [Member] | Money market fund - cash [Member] | Quoted Prices in Active Markets of Identical Assets (Level 1) [Member]
          
Assets [Abstract]          
Cash and Cash Equivalents, Fair Value Disclosure 2,000 2,000   4,384,000  
Recurring [Member] | Money market fund - cash [Member] | Significant Other Observable Inputs (Level 2) [Member]
          
Assets [Abstract]          
Cash and Cash Equivalents, Fair Value Disclosure 0 0   0  
Recurring [Member] | Certificates of deposit [Member]
          
Assets [Abstract]          
Available-for-sale Securities, Fair Value Disclosure 7,036,000 7,036,000   6,645,000  
Recurring [Member] | Certificates of deposit [Member] | Quoted Prices in Active Markets of Identical Assets (Level 1) [Member]
          
Assets [Abstract]          
Available-for-sale Securities, Fair Value Disclosure 0 0   0  
Recurring [Member] | Certificates of deposit [Member] | Significant Other Observable Inputs (Level 2) [Member]
          
Assets [Abstract]          
Available-for-sale Securities, Fair Value Disclosure 7,036,000 7,036,000   6,645,000  
Recurring [Member] | Corporate bonds [Member]
          
Assets [Abstract]          
Available-for-sale Securities, Fair Value Disclosure 16,431,000 16,431,000   12,816,000  
Recurring [Member] | Corporate bonds [Member] | Quoted Prices in Active Markets of Identical Assets (Level 1) [Member]
          
Assets [Abstract]          
Available-for-sale Securities, Fair Value Disclosure 0 0   0  
Recurring [Member] | Corporate bonds [Member] | Significant Other Observable Inputs (Level 2) [Member]
          
Assets [Abstract]          
Available-for-sale Securities, Fair Value Disclosure 16,431,000 16,431,000   12,816,000  
Other assets [Member]
          
Minority Investments [Abstract]          
Investments in privately-held companies 9,900,000 9,900,000   9,400,000  
Minority investments in unconsolidated privately-held companies 325,000 325,000   392,000  
Certificates of deposit [Member]
          
Cash Equivalents, at Carrying Value [Abstract]          
Amortized Cost 7,040,000 7,040,000   6,638,000  
Gross Unrealized Gain   6,000   9,000  
Gross Unrealized (Loss)   (10,000)   (2,000)  
Fair Value 7,036,000 7,036,000   6,645,000  
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract]          
Fair value, in loss position less than twelve months 3,430,000 3,430,000   1,877,000  
Gross unrealized loss, in loss position less than twelve months   (10,000)   (1,000)  
Fair value, in loss position greater than twelve months 0 0   199,000  
Gross unrealized loss, in loss position greater than twelve months   0   (1,000)  
Fair value, total in loss position 3,430,000 3,430,000   2,076,000  
Gross unrealized loss, total in loss position   (10,000)   (2,000)  
Corporate bonds [Member]
          
Cash Equivalents, at Carrying Value [Abstract]          
Amortized Cost 16,523,000 16,523,000   12,872,000  
Gross Unrealized Gain   3,000   7,000  
Gross Unrealized (Loss)   (95,000)   (63,000)  
Fair Value 16,431,000 16,431,000   12,816,000  
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract]          
Fair value, in loss position less than twelve months 12,658,000 12,658,000   6,446,000  
Gross unrealized loss, in loss position less than twelve months   (95,000)   (40,000)  
Fair value, in loss position greater than twelve months 0 0   1,502,000  
Gross unrealized loss, in loss position greater than twelve months   0   (23,000)  
Fair value, total in loss position 12,658,000 12,658,000   7,948,000  
Gross unrealized loss, total in loss position   (95,000)   (63,000)  
Total Investments [Member]
          
Cash Equivalents, at Carrying Value [Abstract]          
Amortized Cost 23,563,000 23,563,000   19,510,000  
Gross Unrealized Gain   9,000   16,000  
Gross Unrealized (Loss)   (105,000)   (65,000)  
Fair Value $ 23,467,000 $ 23,467,000   $ 19,461,000  
[1] The condensed consolidated balance sheet at December 31, 2012 has been derived from the audited consolidated financial statements at that date.