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Derivatives - Effect in the Consolidated Statements of Operations and Comprehensive Income (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Derivative financial instruments on consolidated statements of operations
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income		$ (3,351)	$ (20,987)	$ (31,127)	$ (35,999)
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Earnings	[1]	(2,106)	(12,736)	(3,420)	(12,743)
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		(986)	(8,036)	(16,157)	(15,226)
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Earnings		(307)	9	(533)	153
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		(2,365)	(12,951)	(14,970)	(20,773)
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Earnings		$ (1,799)	$ (266)	$ (2,887)	$ (417)
[1] Amounts reclassified to "Interest expense" in the Company's consolidated statements of operations for the three months ended June 30, 2020 and 2019 are $1,799 and $266, respectively, and amounts reclassified to "Interest expense" in the Company's consolidated statements of operations for the six months ended June 30, 2020 and 2019 are $2,887 and $417, respectively. Amount reclassified to "Income from sales of real estate" in the Company's consolidated statements of operations is $806 for the three and six months ended June 30, 2019. Amounts reclassified to "Earnings (losses) from equity method investments" in the Company's consolidated statements of operations for the three months ended June 30, 2020 and 2019 are $307 and $(9), respectively, and amounts reclassified to "Earnings (losses) from equity method investments" in the Company's consolidated statements of operations for the six months ended June 30, 2020 and 2019 are $533 and $(153), respectively. Amounts reclassified to "Other expense" in the Company's consolidated statements of operations are $11,673 for the three and six months ended June 30, 2019 resulting from hedged forecasted transactions becoming not probable to occur.

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Amount, after tax and before reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669646-108580

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580

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Amount, after tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e689-108580

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580

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