Derivatives - Effect in the Consolidated Statements of Operations and Comprehensive Income (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Derivative financial instruments on consolidated statements of operations
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income		$ (9,091)	$ 3,900	$ (45,090)	$ 6,258
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Earnings	[1]	(665)	(101)	(13,408)	1,683
Derivatives Designated in Hedging Relationships | Interest rate swaps | Earnings from equity method investments
Derivative financial instruments on consolidated statements of operations
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income		(6,082)	1,197	(21,309)	4,705
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Earnings		(126)	44	28	(47)
Derivatives Designated in Hedging Relationships | Interest rate swaps | Interest expense
Derivative financial instruments on consolidated statements of operations
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income		(3,009)	2,702	(23,781)	1,552
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Earnings		$ (539)	$ (144)	$ (957)	$ (144)

[1] Amounts reclassified to "Interest expense" in the Company's consolidated statements of operations is $539 and $957 for the three and nine months ended September 30, 2019, respectively, and $144 for each of the three and nine months ended September 30, 2018. Amount reclassified to "Income from sales of real estate" in the Company's consolidated statements of operations is $806 for the nine months ended September 30, 2019 and amount reclassified to "Gain on consolidation of equity method investment" for the nine months ended September 30, 2018 is $1,876. Amounts reclassified to "Earnings (losses) from equity method investments" in the Company's consolidated statements of operations are $126 and $(28) for the three and nine months ended September 30, 2019, respectively, and $(43) and $47 for the three and nine months ended September 30, 2018, respectively. Amount reclassified to "Other expense" in the Company's consolidated statements of operations is $11,673 for the nine months ended September 30, 2019 resulting from hedged forecasted transactions becoming not probable to occur.