Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis

The table below presents the Company’s assets and liabilities measured at fair value on a recurring basis as of December 31, 2017, aggregated by the level in the fair value hierarchy within which those measurements fall.



			Fair Value Measurements at Reporting Date Using
Description	December 31, 2017		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Other assets - Cash Flow Hedge Swap Agreements	$	38,365	$	—	$	38,365	$	—
Other liabilities - Cash Flow Hedge Swap Agreements	$	9	$	—	$	9	$	—

Schedule of Fair Value of Financial Instruments

The fair values of the Company’s fixed-rate assets and liabilities were as follows for the periods indicated:



	December 31, 2017				December 31, 2016
	Fair Value		Carrying Value		Fair Value		Carrying Value
Notes receivable from Preferred Operating Partnership unit holders	$	113,683	$	120,230	$	125,642	$	120,230
Fixed rate notes receivable	$	20,942	$	20,608	$	53,450	$	52,201
Fixed rate notes payable and notes payable to trusts	$	2,774,242	$	2,815,085	$	2,404,996	$	2,417,558
Exchangeable senior notes	$	719,056	$	624,259	$	706,827	$	638,170

Schedule of Unpaid Claims Liability

The following table presents information on the portion of the Company’s unpaid claims liability, which is included in other liabilities on the Company's consolidated balance sheets, that relates to tenant insurance for the periods indicated:



	For the Year Ended December 31,
Tenant Reinsurance Claims:	2017			2016			2015
Unpaid claims liability at beginning of year	$	3,896		$	3,908		$	3,121
Claims and claim adjustment expense for claims incurred in the current year	11,700			7,250			6,421
Claims and claim adjustment expense (benefit) for claims incurred in the prior years	(203		)	87			—
Payments for current year claims	(8,895		)	(5,423		)	(4,283		)
Payments for prior year claims	(1,331		)	(1,926		)	(1,351		)
Unpaid claims liability at the end of the year	$	5,167		$	3,896		$	3,908

Schedule of Antidilutive Shares Excluded from Computation of Earnings Per Share

The following table presents the number of weighted OP Units and Preferred Operating Partnership units, and the potential common shares, that were excluded from the computation of earnings per share as their effect would have been anti-dilutive:



	For the Year Ended December 31,
	2017	2016	2015
	Equivalent Shares (if converted)	Equivalent Shares (if converted)	Equivalent Shares (if converted)
Common OP Units	—	5,564,631	—
Series A Units (Variable Only)	—	875,480	—
Series B Units	533,174	499,966	579,640
Series C Units	377,135	353,646	410,002
Series D Units	—	552,796	189,649
	910,309	7,846,519	1,179,291

Schedule of Computation of Earnings Per Common Share

The computation of earnings per share is as follows for the periods presented:



	For the Year Ended December 31,
	2017			2016			2015
Net income attributable to common stockholders	$	479,013		$	366,127		$	189,474
Earnings and dividends allocated to participating securities	(975		)	(792		)	(601		)
Earnings for basic computations	478,038			365,335			188,873
Earnings and dividends allocated to participating securities	—			792			—
Income allocated to noncontrolling interest - Preferred Operating Partnership Units and Operating Partnership Units	30,088			—			14,790
Fixed component of income allocated to noncontrolling interest - Preferred Operating Partnership Units (Series A)	(3,119		)	—			(5,088		)
Net income for diluted computations	$	505,007		$	366,127		$	198,575

Weighted average common shares outstanding:
Average number of common shares outstanding - basic	125,967,831			125,087,554			119,816,743
OP Units	5,590,831			—			5,451,357
Series A Units	875,480			—			875,480
Series D Units	1,081,561			—			—
Unvested restricted stock awards included for treasury stock method	—			299,585			—
Shares related to exchangeable senior notes and dilutive stock options	640,068			560,937			775,289
Average number of common shares outstanding - diluted	134,155,771			125,948,076			126,918,869
Earnings per common share
Basic	$	3.79		$	2.92		$	1.58
Diluted	$	3.76		$	2.91		$	1.56