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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, 2015
Dec. 31, 2014
designated as cash flow hedges    
Derivative [Line Items]    
Interest rate swaps - asset position $ 0 $ 0
Interest rate swaps - liability position 1,081 7,732
not designated as cash flow hedges    
Derivative [Line Items]    
Interest rate swaps - asset position 0 0
Interest rate swaps - liability position 9,819 0
Interest Rate Swaps | designated as cash flow hedges    
Derivative [Line Items]    
Interest rate swaps - asset position 0 0
Interest rate swaps - liability position 1,081 7,732
Interest Rate Swaps | not designated as cash flow hedges    
Derivative [Line Items]    
Interest rate swaps - asset position 0 0
Interest rate swaps - liability position $ 9,819 $ 0