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Cash, Cash Equivalents and Investments (Details Textual) (USD $) | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Schedule of Available-for-sale Securities (Textual) [Abstract] |  |  |
Cash balance included foreign bank balance | $ 29,452,000 | $ 23,639,000 |
Other-than-temporary impairment | 0 |  |
Gross realized gains on sale of debt securities | 82,000 | 7,000 | 19,000
Gross realized losses on sale of debt securities | 263,000 |  |
Percentage of aggregate of international portfolio | 11.00% |  |
Maximum amount committed to invest in limited partnership | 20,500,000 |  |
Contribution to limited partnership | 19,886,000 |  |
Remaining amount of commitment in limited partnership | 614,000 |  |
Carrying value of investment | 5,933,000 |  |
Estimated fair value of investment | $ 7,460,000 |  |

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