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Cash and Cash Equivalents (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Cash and cash Equivalents [Abstract]    
Time deposits $ 0 $ 13,129
Money market funds with duration of less than three months 267 823
Restricted cash held as security in the form of a letter of guarantee 831 829
Retention accounts 346 28,700
Restricted cash 1,177 29,529
Long term restricted cash $ 33,429 $ 0