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Cash, Cash Equivalents and Available-for-sale Securities (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
Cash, Cash Equivalents and Marketable Securities
Cash and cash equivalents	$ 12,769	$ 12,769	$ 18,130	$ 12,064	$ 12,416
Available-for-sale securities	19,999	19,999	50,027
Net realized gains or losses	$ 0	$ 0

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. Also includes 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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