Derivatives and Hedging Activities - Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance (Details) - Cash Flow Hedging - Interest rate swaps, net - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (loss) gain recognized in accumulated other comprehensive income (loss) from derivatives (effective portion)	$ (487)	$ (5,045)	$ (15,148)	$ 8,119
Amount of loss recognized in income on derivative instruments (ineffective portion, reclassifications of missed forecasted transactions and amounts excluded from effectiveness testing)	318	(23)	(174)	(89)
Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Amount of loss reclassified from accumulated other comprehensive income into income as interest expense (effective portion)	$ (1,329)	$ (1,170)	$ (3,920)	$ (567)