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Equity - Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 3,910,964	$ 3,702,750	$ 3,729,037
Reclassification related to redemption of common units in the operating partnership		(310,855)	(1,446,039)
Cumulative-effect adjjustment to other comprehensive income		0
Ending balance	3,830,130	3,910,964	3,702,750
Interest expense	83,167	90,037	76,044
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	13,276	5,878	(64)
Unrealized loss (gain) recognized in OCI due to change in fair value	7,358	3,029	(2,867)
Gain reclassified from OCI from income	(3,300)	4,369	8,809
Net change in OCI	4,058	7,398	5,942
Reclassification related to redemption of common units in the operating partnership		0
Cumulative-effect adjjustment to other comprehensive income		231
Ending balance	17,565	13,276	5,878
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	13,227	9,496	(1,081)
Unrealized loss (gain) recognized in OCI due to change in fair value	7,331	3,011	4,122
Gain reclassified from OCI from income	(3,287)	4,342	6,455
Net change in OCI	4,044	7,353	10,577
Reclassification related to redemption of common units in the operating partnership		(3,622)
Cumulative-effect adjjustment to other comprehensive income		230
Ending balance	17,501	13,227	9,496
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Noncontrolling Interest
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	49	(3,618)	1,017
Unrealized loss (gain) recognized in OCI due to change in fair value	27	18	(6,989)
Gain reclassified from OCI from income	(13)	27	2,354
Net change in OCI	14	45	(4,635)
Reclassification related to redemption of common units in the operating partnership		3,622
Cumulative-effect adjjustment to other comprehensive income		1
Ending balance	$ 64	$ 49	$ (3,618)

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