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Above market acquired charters - Carrying Value (Table) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Acquired Finite Lived Intangible Assets      
Carrying amount, beginning of period $ 90,243 $ 100,518  
Acquisitions   4,267  
Amortization (15,208) (14,542) $ (14,864)
Carrying amount, end of period $ 75,035 $ 90,243 $ 100,518