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Cash and cash equivalents (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Dec. 31, 2012
Cash and cash equivalents:
Cash	$ 3,659		$ 3,655
Money market accounts	4,295		23,683
Total cash and cash equivalents	7,954	48,092	27,338	58,138
Interest income	$ 86	$ 104

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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