Accumulated Other Comprehensive Income - Summary of Changes in Accumulated Other Comprehensive Income by Component (Details) - USD ($)		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Accumulated Other Comprehensive Income Loss [Line Items]
Amount of (loss) income related to the effective portion of cash flow hedges recognized in other comprehensive income	[1]	$ (630,000)	$ 3,727,000	$ (4,669,000)	$ (35,554,000)
Amounts reclassified from accumulated other comprehensive income into interest expense	[1]	1,297,000	2,747,000	5,269,000	8,323,000
Unconsolidated Joint Ventures [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Amounts reclassified from accumulated other comprehensive income into interest expense		0	0	0	0
Amount of income (loss) related to unconsolidated joint ventures recognized in other comprehensive income	[1],[2]	$ 204,000	$ (68,000)	$ 42,000	$ (18,000)

[1] Net of amount attributable to the noncontrolling interests in the Operating Partnership.

[2] Balance held in accumulated other comprehensive income relates to foreign currency translation adjustments. No amounts were reclassified from accumulated other comprehensive income during any of the periods set forth above.