Summary Of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2018

Summary Of Significant Accounting Policies [Line Items]

Property, Plant and Equipment [Table Text Block]

Depreciation is computed on a straight-line basis over the estimated useful lives of the assets as follows:

Land improvements	25 to 40 years
Buildings and improvements	10 to 40 years
Tenant improvements	Shorter of useful life or terms of related lease
Furniture, fixtures, and equipment	3 to 7 years

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

The following table summarizes the scheduled amortization of the Company’s acquired “above-” and “below-market” lease intangibles for each of the five succeeding years (in thousands).

	Acquired Above-Market Lease Intangibles		Acquired Below-Market Lease Intangibles
2019	$	7,099	$	27,327
2020	5,394		10,462
2021	2,988		6,348
2022	314		5,669
2023	168		5,558

The following table summarizes the scheduled amortization of the Company’s acquired in-place lease intangibles for each of the five succeeding years (in thousands).

	Acquired In-Place Lease Intangibles
2019	$	25,690
2020	13,051
2021	8,610
2022	4,798
2023	4,107

Schedule Of Future Contractual Minimum Lease Payments Under Non-Cancelable Ground Leases [Table Text Block]

The future contractual minimum lease payments to be made by the Company as of December 31, 2018, under non-cancelable ground leases which expire on various dates through 2114, are as follows:

Years Ending December 31,	(in thousands)
2019	$	11,425
2020	18,425
2021	25,310
2022	8,894
2023	9,084
Thereafter	567,232

Capital Leases in Financial Statements of Lessee Disclosure [Text Block]

Capital Leases

The Company has four capital lease obligations with various initial term expiration dates through 2036. The following reflects the gross amount of assets recorded under capital leases by asset class at December 31, 2018 and December 31, 2017 (in thousands):

	December 31,
	2018		2017
Land held for future development	$	12,397	$	—
Buildings and improvements	23,636		23,636
Construction in progress	28,962		28,962
Total	$	64,995	$	52,598

The future minimum lease payments, as of December 31, 2018, related to the four capital leases, through 2036 are as follows:

Years Ending December 31,	(in thousands)
2019	$	1,441
2020	12,682
2021	2,123
2022	1,253
2023	944
Thereafter	73,241
Total expected minimum lease payments	91,684
Interest portion	(27,497		)
Present value of expected net minimum lease payments	$	64,187

Fair Value, by Balance Sheet Grouping [Table Text Block]

The following table presents the aggregate carrying value of the Company’s related party note receivable, note receivable, mortgage notes payable, net, unsecured senior notes, net, unsecured line of credit and unsecured term loan, net and the Company’s corresponding estimate of fair value as of December 31, 2018 and December 31, 2017 (in thousands):

	December 31, 2018				December 31, 2017
	Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
Related party note receivable	$	80,000	$	80,000	$	—	$	—
Note receivable	19,468		19,468		—		—
Total	$	99,468	$	99,468	$	—	$	—
Mortgage notes payable, net	$	2,964,572	$	2,903,925	$	2,979,281	$	3,042,920
Unsecured senior notes, net	7,544,697		7,469,338		7,247,330		7,461,615
Unsecured line of credit	—		—		45,000		45,000
Unsecured term loan, net	498,488		500,783		—		—
Total	$	11,007,757	$	10,874,046	$	10,271,611	$	10,549,535

Tax Treatment Of Common Dividends Per Share For Federal Tax Purposes, Table [Table Text Block]

The tax treatment of common dividends per share for federal income tax purposes is as follows: 

	For the year ended December 31,
	2018					2017					2016
	Per Share			%		Per Share			%		Per Share			%
Ordinary income	$	2.79		78.17	%	$	2.86		98.29	%	$	2.76		90.51	%
Capital gain income	0.78			21.83	%	0.05			1.71	%	0.29			9.49	%
Total	$	3.57	(1)	100.00	%	$	2.91	(2)	100.00	%	$	3.05	(3)	100.00	%

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(1) The fourth quarter 2018 regular quarterly dividend was $0.95 per common share of which approximately $0.69 per common share was allocable to 2018 and approximately $0.26 per common share is allocable to 2019.

(2) The fourth quarter 2017 regular quarterly dividend was $0.80 per common share of which approximately $0.47 per common share was allocable to 2017 and approximately $0.33 per common share is allocable to 2018.

(3) The fourth quarter 2016 regular quarterly dividend was $0.75 per common share of which approximately $0.56 per common share was allocable to 2016 and approximately $0.19 per common share is allocable to 2017.