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OTHER ASSETS (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
OTHER ASSETS    
Security deposits, net $ 6,289 $ 5,019
Debt issuance costs, net 6,394 4,260
Maintenance agreements, non-current portion 2,093 1,614
Restricted cash 158 158
Other 179 623
Total $ 15,113 $ 11,674