Accumulated Other Comprehensive Income - Summary of Changes in Accumulated Other Comprehensive Income by Component (Details) - USD ($)		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Accumulated Other Comprehensive Income Loss [Line Items]
Amount of income related to the effective portion of cash flow hedges recognized in other comprehensive income		$ 12,751,000	$ 1,306,000
Amounts reclassified from accumulated other comprehensive income into interest and debt expense		428,000	2,212,000
Unconsolidated Joint Ventures [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Amounts reclassified from accumulated other comprehensive income into interest and debt expense		0	0
Amount of income (loss) related to unconsolidated joint ventures recognized in other comprehensive income	[1]	$ 50,000	$ (194,000)

[1] Represents foreign currency translation adjustments. No amounts were reclassified from accumulated other comprehensive income during any of the periods set forth above.