v2.4.0.8
Investments and Fair Value Measurements (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Investment
Jun. 30, 2012
Jun. 30, 2013
Investment
Jun. 30, 2012
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]          
Amortized Cost $ 52,679,000   $ 52,679,000   $ 34,264,000
Unrealized Gains (Losses) (555,000)   (555,000)   (269,000)
Aggregate Fair Value 52,124,000   52,124,000   33,995,000
Cash and cash equivalents 50,000   50,000   1,150,000
Short-term available-for-sale securities 51,358,000   51,358,000   32,122,000
Long-term available-for-sale securities 716,000   716,000   723,000
Aggregate fair value of short-term municipal bonds 42,100,000   42,100,000   26,100,000
Financial assets [Abstract]          
ARS 716,000   716,000   723,000
Money market funds 50,000   50,000   1,150,000
Municipal securities 51,358,000 [1]   51,358,000 [1]   32,122,000 [1]
Foreign currency exchange contracts 36,000   36,000   952,000
Total financial assets 52,160,000   52,160,000   34,947,000
Financial liabilities [Abstract]          
Foreign currency exchange contracts 447,000   447,000   115,000
Total financial liabilities 447,000   447,000   115,000
Short-term municipal security funds as a percentage of municipal securities (in hundredths) 82.00%   82.00%   82.00%
Municipal revenue bonds as a percentage of municipal securities (in hundredths) 11.00%   11.00%   12.00%
Municipal general obligation bonds as a percentage of municipal securities (in hundredths) 7.00%   7.00%   6.00%
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]          
Interest and dividend income 160,000 618,000 287,000 859,000  
Reconciliation of available-for-sale ARS measured at fair value on a recurring basis using Level 3 inputs [Roll Forward]          
Beginning balance 729,000 703,000 723,000 700,000  
Total realized / unrealized losses [abstract]          
Included in earnings 0 0 0 0  
Included in OCI (13,000) 11,000 (7,000) 14,000  
Sales and settlements 0 0 0 0  
Ending balance 716,000 714,000 716,000 714,000  
Number of investments that failed at auction 1   1    
Principal amount of failed ARS auction 1,000,000   1,000,000    
Basis points (in hundredths) 3.43%   3.43%    
Valuation of Ars after discount has been applied 700,000   700,000    
Cost basis 1,000,000   1,000,000    
Accumulated Other Comprehensive Income, unrealized gains and losses on available for sale securities [Roll Forward]          
Balance, January 1,     (180,000) 135,000  
Other comprehensive income, net of income taxes     (186,000) (27,000)  
Balance, June 30, (366,000) 108,000 (366,000) 108,000  
Reclassification Out Of Accumulated Other Comprehensive Income [Member]
          
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]          
Interest and dividend income 8,000 239,000 8,000 239,000  
Quoted Prices in Active Markets for Identical Assets (Level 1)
          
Financial assets [Abstract]          
ARS 0   0   0
Money market funds 50,000   50,000   1,150,000
Municipal securities 51,358,000 [1]   51,358,000 [1]   32,122,000 [1]
Foreign currency exchange contracts 0   0   0
Total financial assets 51,408,000   51,408,000   33,272,000
Financial liabilities [Abstract]          
Foreign currency exchange contracts 0   0   0
Total financial liabilities 0   0   0
Significant Other Observable Inputs (Level 2) [Member]
          
Financial assets [Abstract]          
ARS 0   0   0
Money market funds 0   0   0
Municipal securities 0 [1]   0 [1]   0 [1]
Foreign currency exchange contracts 36,000   36,000   952,000
Total financial assets 36,000   36,000   952,000
Financial liabilities [Abstract]          
Foreign currency exchange contracts 447,000   447,000   115,000
Total financial liabilities 447,000   447,000   115,000
Significant Other Unobservable Inputs (Level 3) [Member]
          
Financial assets [Abstract]          
ARS 716,000   716,000   723,000
Money market funds 0   0   0
Municipal securities 0 [1]   0 [1]   0 [1]
Foreign currency exchange contracts 0   0   0
Total financial assets 716,000   716,000   723,000
Financial liabilities [Abstract]          
Foreign currency exchange contracts 0   0   0
Total financial liabilities 0   0   0
Auction Rate Securities ("ARS"), Greater Than One Year [Member]
          
Schedule of Available-for-sale Securities [Line Items]          
Amortized Cost 1,000,000   1,000,000   1,000,000
Unrealized Gains (Losses) (284,000)   (284,000)   (277,000)
Aggregate Fair Value 716,000   716,000   723,000
Cash and cash equivalents 0   0   0
Short-term available-for-sale securities 0   0   0
Long-term available-for-sale securities 716,000   716,000   723,000
Money Market Funds, Ninety Days or Less [Member]
          
Schedule of Available-for-sale Securities [Line Items]          
Amortized Cost 50,000   50,000   1,150,000
Unrealized Gains (Losses) 0   0   0
Aggregate Fair Value 50,000   50,000   1,150,000
Cash and cash equivalents 50,000   50,000   1,150,000
Short-term available-for-sale securities 0   0   0
Long-term available-for-sale securities 0   0   0
Municipal Securities Maturing in One Year or Less [Member]
          
Schedule of Available-for-sale Securities [Line Items]          
Amortized Cost 43,093,000 [2],[3]   43,093,000 [2],[3]   26,885,000 [2],[3]
Unrealized Gains (Losses) (109,000) [2],[3]   (109,000) [2],[3]   (1,000) [2],[3]
Aggregate Fair Value 42,984,000 [2],[3]   42,984,000 [2],[3]   26,884,000 [2],[3]
Cash and cash equivalents 0 [2],[3]   0 [2],[3]   0 [2],[3]
Short-term available-for-sale securities 42,984,000 [2],[3]   42,984,000 [2],[3]   26,884,000 [2],[3]
Long-term available-for-sale securities 0 [2],[3]   0 [2],[3]   0 [2],[3]
Municipal Securities Maturing After One Year Through Three Years [Member]
          
Schedule of Available-for-sale Securities [Line Items]          
Amortized Cost 2,517,000 [2]   2,517,000 [2]   1,345,000 [2]
Unrealized Gains (Losses) 2,000 [2]   2,000 [2]   7,000 [2]
Aggregate Fair Value 2,519,000 [2]   2,519,000 [2]   1,352,000 [2]
Cash and cash equivalents 0 [2]   0 [2]   0 [2]
Short-term available-for-sale securities 2,519,000 [2]   2,519,000 [2]   1,352,000 [2]
Long-term available-for-sale securities 0 [2]   0 [2]   0 [2]
Municipal Securities Maturing Greater Than Three Years [Member]
          
Schedule of Available-for-sale Securities [Line Items]          
Amortized Cost 6,019,000 [2]   6,019,000 [2]   3,884,000 [2]
Unrealized Gains (Losses) (164,000) [2]   (164,000) [2]   2,000 [2]
Aggregate Fair Value 5,855,000 [2]   5,855,000 [2]   3,886,000 [2]
Cash and cash equivalents 0 [2]   0 [2]   0 [2]
Short-term available-for-sale securities 5,855,000 [2]   5,855,000 [2]   3,886,000 [2]
Long-term available-for-sale securities $ 0 [2]   $ 0 [2]   $ 0 [2]
[1] At June 30, 2013, municipal securities consisted of an 82/11/7 percent split between holdings in short-term municipal security funds, municipal revenue bonds and municipal general obligation bonds, respectively. At December 31, 2012, municipal securities consisted of an 82/12/6 split between holdings in short-term municipal security funds, municipal revenue bonds and municipal general obligation bonds, respectively. The underlying credit rating of the municipal securities at June 30, 2013 and December 31, 2012 were A+, A1 or better as defined by S&P 500 and Moody’s, respectively.
[2] Expected maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties.
[3] Amounts include short-term municipal security funds that do not have a set maturity date. The aggregate fair value of short-term municipal securities was $42.1 million and $26.1 million as of June 30, 2013, and December 31, 2012, respectively.