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Cash, Cash Equivalents and Restricted Cash (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
Cash, Cash Equivalents and Restricted Cash
Cash and cash equivalents	$ 259,153,000	$ 227,986,000
Restricted cash deposits kept as collateral for outstanding letters of credit	84,400,000	89,500,000
Restricted cash
Restricted cash	85,253,000	90,034,000
RMC
Restricted cash
Restricted cash	$ 832,000	$ 487,000

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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