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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
Jun. 30, 2016
Dec. 31, 2015
Not designated as cash flow hedges    
ASSETS    
Interest rate swaps - asset position $ 0 $ 0
Total 0 0
LIABILITIES    
Interest rate swaps - liability position 9,155 7,642
Total 9,155 7,642
Designated as cash flow hedges    
ASSETS    
Interest rate swaps - asset position 0 0
Total 0 0
LIABILITIES    
Interest rate swaps - liability position 1,362 807
Total $ 1,362 $ 807