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Cash and Cash Equivalents - Geographic Information (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 97,102	$ 112,521	$ 90,400	$ 76,174
United States [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	20,134	43,546
Asia [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	63,540	50,799
Europe [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	10,424	12,912
South America [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 3,004	$ 5,264

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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