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Prepaid lease rentals (Table) (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Prepaid lease rentals [Abstract]:    
Prepaid lease rentals $ 45,793 $ 49,817
Less: Amortization of prepaid lease rentals (2,470) (4,024)
Prepaid lease rentals 43,323 45,793
Less: Current portion (4,989) (4,982)
Non-current portion $ 38,334 $ 40,811