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Fair Value Measurement - Cash and Cash Equivalents (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
Cash Equivalents, at Carrying Value [Abstract]
Cash equivalents	$ 31,583	$ 89,336	$ 144,605
Cash	114,875	139,785	103,228
Total cash and cash equivalents	$ 146,458	$ 229,121	$ 247,833	$ 321,990

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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