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Derivatives - Effect on Statements of Operations (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Derivative Instruments, (Gain) Loss [Line Items]        
Interest expense presented in Results of Operations in which the effects of cash flow hedges are recorded $ 16,817 $ 21,435 $ 35,582 $ 106,967
Interest rate swaps | Cash flow hedges        
Derivative Instruments, (Gain) Loss [Line Items]        
Amount of (gain) loss recognized in other comprehensive income on derivative (effective portion) (1,138) 59 (3,805) (413)
Amount of (gain) loss reclassified from AOCI into income (effective portion) $ (279) (86) $ (192) 74
Amount of loss recognized in income on derivative (ineffective portion and amount excluded from effectiveness testing)   $ 5   $ 11