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Investments and Fair Value Measurements (Details) (USD $)
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3 Months Ended | 9 Months Ended | ||||||||||||
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Sep. 30, 2013
Investment
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Sep. 30, 2012
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Sep. 30, 2013
Investment
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Sep. 30, 2012
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Dec. 31, 2012
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| Schedule of Available-for-sale Securities [Line Items] | ||||||||||||||
| Amortized Cost | $ 37,748,000 | $ 37,748,000 | $ 34,264,000 | |||||||||||
| Unrealized Gains (Losses) | (522,000) | (522,000) | (269,000) | |||||||||||
| Aggregate Fair Value | 37,226,000 | 37,226,000 | 33,995,000 | |||||||||||
| Cash and cash equivalents | 269,000 | 269,000 | 1,150,000 | |||||||||||
| Short-term available-for-sale securities | 36,240,000 | 36,240,000 | 32,122,000 | |||||||||||
| Long-term available-for-sale securities | 717,000 | 717,000 | 723,000 | |||||||||||
| Non-financial assets [Abstract] | ||||||||||||||
| Property and equipment, net | 10,954,000 | 10,954,000 | ||||||||||||
| Financial assets [Abstract] | ||||||||||||||
| ARS | 717,000 | 717,000 | 723,000 | |||||||||||
| Money market funds | 269,000 | 269,000 | 1,150,000 | |||||||||||
| Municipal securities | 36,240,000 | [1] | 36,240,000 | [1] | 32,122,000 | [1] | ||||||||
| Foreign currency exchange contracts | 116,000 | 116,000 | 952,000 | |||||||||||
| Total financial assets | 37,342,000 | 37,342,000 | 34,947,000 | |||||||||||
| Financial liabilities [Abstract] | ||||||||||||||
| Foreign currency exchange contracts | 206,000 | 206,000 | 115,000 | |||||||||||
| Total financial liabilities | 206,000 | 206,000 | 115,000 | |||||||||||
| Short-term municipal security funds as a percentage of municipal securities (in hundredths) | 75.00% | 75.00% | 82.00% | |||||||||||
| Municipal revenue bonds as a percentage of municipal securities (in hundredths) | 14.00% | 14.00% | 12.00% | |||||||||||
| Municipal general obligation bonds as a percentage of municipal securities (in hundredths) | 11.00% | 11.00% | 6.00% | |||||||||||
| Reconciliation of available-for-sale ARS measured at fair value on a recurring basis using Level 3 inputs [Roll Forward] | ||||||||||||||
| Beginning balance | 716,000 | 714,000 | 723,000 | 700,000 | ||||||||||
| Total realized / unrealized losses [Abstract] | ||||||||||||||
| Included in earnings | 0 | 0 | 0 | 0 | ||||||||||
| Included in OCI | 1,000 | 5,000 | (6,000) | 19,000 | ||||||||||
| Sales and settlements | 0 | 0 | 0 | 0 | ||||||||||
| Transfers into Level 3, net | 0 | 0 | 0 | 0 | ||||||||||
| Ending balance | 717,000 | 719,000 | 717,000 | 719,000 | ||||||||||
| 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) | 3.40% | 3.40% | ||||||||||||
| Valuation of Ars after discount has been applied | 700,000 | 700,000 | ||||||||||||
| Cost basis | 1,000,000 | 1,000,000 | ||||||||||||
| Accumulated Other Comprehensive Income (Loss) [Line Items] | ||||||||||||||
| Balance, beginning of period | 364,000 | |||||||||||||
| Reclassification into interest and dividend income (loss) | 71,000 | 595,000 | 358,000 | 1,454,000 | ||||||||||
| Effect of incomes taxes | 12,000 | (92,000) | (89,000) | (107,000) | ||||||||||
| Balance, end of period | (403,000) | (403,000) | ||||||||||||
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Available-for-sale securities [Member]
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| Accumulated Other Comprehensive Income (Loss) [Line Items] | ||||||||||||||
| Balance, beginning of period | (366,000) | 108,000 | (180,000) | 135,000 | ||||||||||
| Change before reclassification | (24,000) | 66,000 | (216,000) | 193,000 | ||||||||||
| Effect of incomes taxes | (25,000) | 127,000 | (28,000) | 211,000 | ||||||||||
| Other comprehensive income (loss), net of income taxes | 21,000 | (171,000) | (165,000) | (198,000) | ||||||||||
| Balance, end of period | (345,000) | (63,000) | (345,000) | (63,000) | ||||||||||
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Available-for-sale securities [Member] | Reclassification Out of Accumulated Other Comprehensive Income [Member]
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| Accumulated Other Comprehensive Income (Loss) [Line Items] | ||||||||||||||
| Reclassification into interest and dividend income (loss) | 70,000 | (364,000) | 79,000 | (602,000) | ||||||||||
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Quoted Prices in Active Markets for Identical Assets (Level 1)
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| Non-financial assets [Abstract] | ||||||||||||||
| Property and equipment, net | 0 | 0 | ||||||||||||
| Financial assets [Abstract] | ||||||||||||||
| ARS | 0 | 0 | 0 | |||||||||||
| Money market funds | 269,000 | 269,000 | 1,150,000 | |||||||||||
| Municipal securities | 36,240,000 | [1] | 36,240,000 | [1] | 32,122,000 | [1] | ||||||||
| Foreign currency exchange contracts | 0 | 0 | 0 | |||||||||||
| Total financial assets | 36,509,000 | 36,509,000 | 33,272,000 | |||||||||||
| Financial liabilities [Abstract] | ||||||||||||||
| Foreign currency exchange contracts | 0 | 0 | 0 | |||||||||||
| Total financial liabilities | 0 | 0 | 0 | |||||||||||
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Significant Other Observable Inputs (Level 2) [Member]
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| Non-financial assets [Abstract] | ||||||||||||||
| Property and equipment, net | 0 | 0 | ||||||||||||
| 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 | 116,000 | 116,000 | 952,000 | |||||||||||
| Total financial assets | 116,000 | 116,000 | 952,000 | |||||||||||
| Financial liabilities [Abstract] | ||||||||||||||
| Foreign currency exchange contracts | 206,000 | 206,000 | 115,000 | |||||||||||
| Total financial liabilities | 206,000 | 206,000 | 115,000 | |||||||||||
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Significant Other Unobservable Inputs (Level 3) [Member]
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| Non-financial assets [Abstract] | ||||||||||||||
| Property and equipment, net | 10,954,000 | 10,954,000 | ||||||||||||
| Financial assets [Abstract] | ||||||||||||||
| ARS | 717,000 | 717,000 | 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 | 717,000 | 717,000 | 723,000 | |||||||||||
| Financial liabilities [Abstract] | ||||||||||||||
| Foreign currency exchange contracts | 0 | 0 | 0 | |||||||||||
| Total financial liabilities | 0 | 0 | 0 | |||||||||||
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Auction Rate Securities ("ARS"), Greater Than One Year [Member]
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| Schedule of Available-for-sale Securities [Line Items] | ||||||||||||||
| Amortized Cost | 1,000,000 | 1,000,000 | 1,000,000 | |||||||||||
| Unrealized Gains (Losses) | (283,000) | (283,000) | (277,000) | |||||||||||
| Aggregate Fair Value | 717,000 | 717,000 | 723,000 | |||||||||||
| Cash and cash equivalents | 0 | 0 | 0 | |||||||||||
| Short-term available-for-sale securities | 0 | 0 | 0 | |||||||||||
| Long-term available-for-sale securities | 717,000 | 717,000 | 723,000 | |||||||||||
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Money Market Funds, Ninety Days or Less [Member]
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| Schedule of Available-for-sale Securities [Line Items] | ||||||||||||||
| Amortized Cost | 269,000 | 269,000 | 1,150,000 | |||||||||||
| Unrealized Gains (Losses) | 0 | 0 | 0 | |||||||||||
| Aggregate Fair Value | 269,000 | 269,000 | 1,150,000 | |||||||||||
| Cash and cash equivalents | 269,000 | 269,000 | 1,150,000 | |||||||||||
| Short-term available-for-sale securities | 0 | 0 | 0 | |||||||||||
| Long-term available-for-sale securities | 0 | 0 | 0 | |||||||||||
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Short Term Municipal Securities Funds [Member]
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| Schedule of Available-for-sale Securities [Line Items] | ||||||||||||||
| Amortized Cost | 27,343,000 | [2],[3] | 27,343,000 | [2],[3] | 26,095,000 | [2],[3] | ||||||||
| Unrealized Gains (Losses) | (117,000) | [2],[3] | (117,000) | [2],[3] | (3,000) | [2],[3] | ||||||||
| Aggregate Fair Value | 27,226,000 | [2],[3] | 27,226,000 | [2],[3] | 26,092,000 | [2],[3] | ||||||||
| Cash and cash equivalents | 0 | [2],[3] | 0 | [2],[3] | 0 | [2],[3] | ||||||||
| Short-term available-for-sale securities | 27,226,000 | [2],[3] | 27,226,000 | [2],[3] | 26,092,000 | [2],[3] | ||||||||
| Long-term available-for-sale securities | 0 | [2],[3] | 0 | [2],[3] | 0 | [2],[3] | ||||||||
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Municipal Securities Maturing in One Year or Less [Member]
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| Schedule of Available-for-sale Securities [Line Items] | ||||||||||||||
| Amortized Cost | 775,000 | [2],[3] | 775,000 | [2],[3] | 790,000 | [2],[3] | ||||||||
| Unrealized Gains (Losses) | 3,000 | [2],[3] | 3,000 | [2],[3] | 2,000 | [2],[3] | ||||||||
| Aggregate Fair Value | 778,000 | [2],[3] | 778,000 | [2],[3] | 792,000 | [2],[3] | ||||||||
| Cash and cash equivalents | 0 | [2],[3] | 0 | [2],[3] | 0 | [2],[3] | ||||||||
| Short-term available-for-sale securities | 778,000 | [2],[3] | 778,000 | [2],[3] | 792,000 | [2],[3] | ||||||||
| Long-term available-for-sale securities | 0 | [2],[3] | 0 | [2],[3] | 0 | [2],[3] | ||||||||
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Municipal Securities Maturing After One Year Through Three Years [Member]
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| Schedule of Available-for-sale Securities [Line Items] | ||||||||||||||
| Amortized Cost | 2,482,000 | [2] | 2,482,000 | [2] | 1,345,000 | [2] | ||||||||
| Unrealized Gains (Losses) | 4,000 | [2] | 4,000 | [2] | 7,000 | [2] | ||||||||
| Aggregate Fair Value | 2,486,000 | [2] | 2,486,000 | [2] | 1,352,000 | [2] | ||||||||
| Cash and cash equivalents | 0 | [2] | 0 | [2] | 0 | [2] | ||||||||
| Short-term available-for-sale securities | 2,486,000 | [2] | 2,486,000 | [2] | 1,352,000 | [2] | ||||||||
| Long-term available-for-sale securities | 0 | [2] | 0 | [2] | 0 | [2] | ||||||||
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Municipal Securities Maturing Greater Than Three Years [Member]
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| Schedule of Available-for-sale Securities [Line Items] | ||||||||||||||
| Amortized Cost | 5,879,000 | [2] | 5,879,000 | [2] | 3,884,000 | [2] | ||||||||
| Unrealized Gains (Losses) | (129,000) | [2] | (129,000) | [2] | 2,000 | [2] | ||||||||
| Aggregate Fair Value | 5,750,000 | [2] | 5,750,000 | [2] | 3,886,000 | [2] | ||||||||
| Cash and cash equivalents | 0 | [2] | 0 | [2] | 0 | [2] | ||||||||
| Short-term available-for-sale securities | 5,750,000 | [2] | 5,750,000 | [2] | 3,886,000 | [2] | ||||||||
| Long-term available-for-sale securities | $ 0 | [2] | $ 0 | [2] | $ 0 | [2] | ||||||||
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