Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2016

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

Deferred leasing costs and acquired lease-related intangible assets at December 31, 2016 and 2015, excluding amounts classified as held-for-sale, were as follows (in thousands):



	2016			2015
Deferred leasing costs	$	323,534		$	302,282
Acquired lease-related intangible assets	268,978			289,518
	$	592,512		$	591,800

Accumulated amortization - deferred leasing costs	$	(108,227	)	$	(106,912	)
Accumulated amortization - acquired lease-related intangible assets	(142,022		)	(138,514		)
Total	$	342,263		$	346,374

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
2017	$	32,381	$	987
2018	24,532		755
2019	18,452		718
2020	12,977		640
2021	8,210		368
Thereafter	26,148		788
	$	122,700	$	4,256

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):



	2016			2015			2014
General Partner
Net income attributable to common shareholders	$	312,143		$	615,310		$	204,893
Less: Dividends on participating securities	(2,356		)	(3,081		)	(2,588		)
Basic net income attributable to common shareholders	309,787			612,229			202,305
Add back dividends on dilutive participating securities	2,356			3,081			—
Noncontrolling interest in earnings of common unitholders	3,089			6,404			2,627
Diluted net income attributable to common shareholders	$	315,232		$	621,714		$	204,932
Weighted average number of common shares outstanding	349,942			345,057			335,777
Weighted average Limited Partner Units outstanding	3,481			3,582			4,308
Other potential dilutive shares	3,653			3,558			361
Weighted average number of common shares and potential dilutive securities	357,076			352,197			340,446

Partnership
Net income attributable to common unitholders	$	315,232		$	621,714		$	207,520
Less: Distributions on participating securities	(2,356		)	(3,081		)	(2,588		)
Basic net income attributable to common unitholders	$	312,876		$	618,633		$	204,932
Add back distributions on dilutive participating securities	2,356			3,081			—
Diluted net income attributable to common unitholders	$	315,232		$	621,714		$	204,932
Weighted average number of Common Units outstanding	353,423			348,639			340,085
Other potential dilutive units	3,653			3,558			361
Weighted average number of Common Units and potential dilutive securities	357,076			352,197			340,446

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

The following table summarizes the data that is excluded from the computation of net income per common share or Common Unit as a result of being anti-dilutive (in thousands):



	2016	2015	2014
General Partner and Partnership
Other potential dilutive shares or units:
Anti-dilutive outstanding potential shares or units under fixed stock option and other stock-based compensation plans	175	997	1,210
Anti-dilutive outstanding participating securities	—	—	3,844

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, 2016, 2015 and 2014 (in thousands):



	2016			2015			2014
Net income	$	315,278		$	621,861		$	246,455
Book/tax differences	(61,138		)	(316,097		)	738
Taxable income before the dividends paid deduction	254,140			305,764			247,193
Less: capital gains	(63,196		)	(294,901		)	(95,797		)
Adjusted taxable income subject to the 90% distribution requirement	$	190,944		$	10,863		$	151,396

Computation of Dividends Paid Deduction

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



	2016			2015			2014
Total Cash dividends paid	$	255,279		$	307,169		$	255,622
Less: Return of capital	(6,703		)	—			(5,479		)
Plus: Deemed REIT distribution	6,703			—			—
Dividends paid deduction	255,279			307,169			250,143
Less: Capital gain distributions	(63,196		)	(294,901		)	(95,797		)
Dividends paid deduction attributable to adjusted taxable income subject to the 90% distribution requirement	$	192,083		$	12,268		$	154,346

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, 2016, 2015 and 2014 is as follows:



	2016		2015		2014
Common Shares
Ordinary income	72.6	%	4.2	%	59.2	%
Return of capital	2.6	%	—	%	2.5	%
Capital gains	24.8	%	95.8	%	38.3	%
	100.0	%	100.0	%	100.0	%
Preferred Shares
Ordinary income					60.7	%
Capital gains					39.3	%
					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, 2016, 2015 and 2014, respectively, by the levels in the fair value hierarchy (in thousands):



	2016				2015				2014
	Level 1	Level 2	Level 3		Level 1	Level 2	Level 3		Level 1	Level 2	Level 3
Real estate assets	—	—	$	34,744	—	—	$	31,100	—	—	$	146,767
Investment in land joint ventures	—	—	$	—	—	—	$	19,500	—	—	$	—