Accumulated Other Comprehensive Income - Summary of Changes in Accumulated Other Comprehensive Income by Component (Parenthetical) (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]
Amounts reclassified from accumulated other comprehensive income	[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		$ 0	$ 0	$ 0	$ 0

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