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Cash, Cash Equivalents and Investments (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Cash and investments
Cash	$ 14,161	$ 17,028
Cash equivalents	13,629	2,390
Short-term investments	37,174	42,210
Long-term investments	1,054	7,177
Cash and investments	$ 66,018	$ 68,805

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

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- Definition

Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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