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Cash, Cash Equivalents and Investments (Details Textual) (USD $)	12 Months Ended
	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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This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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