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Fair value measurements - Fair value on a recurring basis - Significant Other Observable Inputs (Table) (Details) - Significant Other Observable Inputs (Level 2) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Designated as cash flow hedges    
ASSETS    
Interest rate swaps - asset position $ 0 $ 0
Total 0 0
LIABILITIES    
Interest rate swaps - liability position (current and non-current) 807 7,732
Total 807 7,732
Not designated as cash flow hedges    
ASSETS    
Interest rate swaps - asset position 0 0
Total 0 0
LIABILITIES    
Interest rate swaps - liability position (current and non-current) 7,642 0
Total $ 7,642 $ 0