Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block]

Deferred leasing costs and acquired lease-related intangible assets at December 31, 2019 and 2018, excluding amounts classified as held-for-sale, were as follows (in thousands):



	2019			2018
Deferred leasing costs	$	333,706		$	307,486
Acquired lease-related intangible assets	190,595			207,057
	$	524,301		$	514,543

Accumulated amortization - deferred leasing costs	$	(109,843	)	$	(101,403	)
Accumulated amortization - acquired lease-related intangible assets	(94,014		)	(99,341		)
Total	$	320,444		$	313,799

Schedule of Future Amortized Expense and Charge to Rental Income

The expected future amortization, or charge to rental income, of acquired lease-related intangible assets is summarized in the table below (in thousands):



Year	Amortization Expense		Charge to Rental Income
2020	$	18,989	$	639
2021	16,063		367
2022	13,192		353
2023	11,246		353
2024	8,690		59
Thereafter	26,630		—
	$	94,810	$	1,771

Schedule of Earnings Per Share, Basic and Diluted

The following table reconciles the components of basic and diluted net income per common share or Common Unit (in thousands):



	2019			2018			2017
General Partner
Net income attributable to common shareholders	$	428,972		$	383,729		$	1,634,431
Less: Dividends on participating securities	(1,487		)	(1,675		)	(3,981		)
Basic net income attributable to common shareholders	427,485			382,054			1,630,450
Add back dividends on dilutive participating securities	1,487			1,675			3,981
Noncontrolling interest in earnings of common unitholders	3,678			3,528			15,176
Diluted net income attributable to common shareholders	$	432,650		$	387,257		$	1,649,607
Weighted average number of common shares outstanding	362,234			357,569			355,762
Weighted average Limited Partner Units outstanding	3,118			3,290			3,303
Other potential dilutive shares	1,987			2,438			2,946
Weighted average number of common shares and potential dilutive securities	367,339			363,297			362,011

Partnership
Net income attributable to common unitholders	$	432,650		$	387,257		$	1,649,607
Less: Distributions on participating securities	(1,487		)	(1,675		)	(3,981		)
Basic net income attributable to common unitholders	$	431,163		$	385,582		$	1,645,626
Add back distributions on dilutive participating securities	1,487			1,675			3,981
Diluted net income attributable to common unitholders	$	432,650		$	387,257		$	1,649,607
Weighted average number of Common Units outstanding	365,352			360,859			359,065
Other potential dilutive units	1,987			2,438			2,946
Weighted average number of Common Units and potential dilutive securities	367,339			363,297			362,011

Reconciliation of Net Income to Taxable Income Before Dividends Paid Deduction

The following table reconciles the General Partner's net income to taxable income before the dividends paid deduction, and subject to the 90% distribution requirement, for the years ended December 31, 2019, 2018 and 2017 (in thousands):



	2019			2018			2017
Net income	$	432,644		$	387,268		$	1,654,341
Book/tax differences	(118,481		)	(97,079		)	(1,073,552		)
Taxable income before the dividends paid deduction	314,163			290,189			580,789
Less: capital gains	(61,531		)	(63,151		)	(441,577		)
Adjusted taxable income subject to the 90% distribution requirement	$	252,632		$	227,038		$	139,212

Computation of Dividends Paid Deduction

The General Partner's dividends paid deduction is summarized below (in thousands):



	2019			2018			2017
Cash dividends paid	$	318,702		$	291,502		$	576,832
Cash dividends declared and paid in subsequent year that apply to current year	7,500			9,286			7,901
Cash dividends declared and paid in current year that apply to previous year	(9,286		)	(7,901		)	—
Dividends paid deduction	316,916			292,887			584,733
Less: Capital gain distributions	(61,531		)	(63,151		)	(441,577		)
Dividends paid deduction attributable to adjusted taxable income subject to the 90% distribution requirement	$	255,385		$	229,736		$	143,156

Summary of Tax Characterization of Dividends Paid

A summary of the tax characterization of the dividends paid by the General Partner for the years ended December 31, 2019, 2018 and 2017 is as follows:



	2019		2018		2017
Common Shares
Ordinary income	80.7	%	78.4	%	23.7	%
Capital gains	19.3	%	21.6	%	76.3	%
	100.0	%	100.0	%	100.0	%

Fair Value Measurements, Nonrecurring [Table Text Block]

The table below aggregates the total fair value of these impaired assets as determined during the years ended December 31, 2019, 2018 and 2017, respectively, by the levels in the fair value hierarchy (in thousands):



	2019				2018				2017
	Level 1	Level 2	Level 3		Level 1	Level 2	Level 3		Level 1	Level 2	Level 3
Real estate assets	—	—	$	—	—	—	$	—	—	—	$	14,299

Operating Lease, Lease Income [Table Text Block]

The components of Rental and Related Revenue for the years ended December 31, 2019, 2018 and 2017 are as follows (in thousands and including discontinued operations):



	2019		2018		2017
Rental revenue - fixed payments	$	645,759	$	587,187	$	585,064
Rental revenue - variable payments (1)	210,074		198,249		188,635
Rental and related revenue	$	855,833	$	785,436	$	773,699

(1) Primarily includes tenant recoveries for real estate taxes, insurance and CAM.

Schedule of Future Minimum Payments Receivable [Table Text Block]

The future minimum rents due to us under non-cancelable operating leases are as follows (in thousands):



Year	December 31, 2019
2020	$	641,578
2021	640,615
2022	577,591
2023	507,101
2024	439,324
Thereafter	1,954,723
	$	4,760,932

Lessee, Operating Lease, Liability, Maturity [Table Text Block]

The following table summarizes the future operating lease payments (in thousands) to be made under our non-cancellable lease arrangements:



Year	December 31, 2019		Year	December 31, 2018
2020	$	8,299	2019	$	6,487
2021	3,864		2020	7,594
2022	3,655		2021	2,987
2023	3,431		2022	2,255
2024	2,865		2023	1,949
Thereafter	84,119		Thereafter	85,523
Total undiscounted operating lease payments	$	106,233	Total undiscounted operating lease payments	$	106,795
Less: imputed interest	59,331
Present value of operating lease payments	$	46,902