CONSOLIDATED STATEMENTS OF EQUITY - USD ($)		Total		Cumulative Effect, Period of Adoption, Adjustment		Total Stockholders' Equity	Total Stockholders' Equity Cumulative Effect, Period of Adoption, Adjustment		Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Deficit Cumulative Effect, Period of Adoption, Adjustment		Accumulated Other Comprehensive (Loss)	Accumulated Other Comprehensive (Loss) Cumulative Effect, Period of Adoption, Adjustment	Treasury Stock	Noncontrolling Interests	[1]	Bridges at Mint Hill	Bridges at Mint Hill Noncontrolling Interests	[1]	Associations of Unit Owners	Associations of Unit Owners Noncontrolling Interests	[1]
Balance at the beginning of the period (in shares) at Dec. 31, 2017									43,300,253
Balance at the beginning of the period at Dec. 31, 2017		$ 3,188,551,000				$ 3,182,986,000			$ 433,000	$ 3,302,502,000	$ (109,508,000)			$ (6,965,000)	$ (739,000)	$ (3,476,000)	$ 5,565,000
Balance at the beginning of the period (Adoption of ASU 2014-09) at Dec. 31, 2017	[2]			$ (69,732,000)			$ (69,732,000)					$ (69,732,000)
Balance at the beginning of the period (Adoption of ASU 2017-12) at Dec. 31, 2017												739,000			$ (739,000)
Balance at the beginning of the period (in shares) at Dec. 31, 2017																(29,373)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		57,726,000				57,012,000					57,012,000						714,000
Preferred dividend payment on behalf of subsidiary		(11,000)															(11,000)
Interest rate swaps, net of tax		(63,000)	[3]			(63,000)								(63,000)
Pension adjustment, net of tax		759,000	[4]			759,000								759,000
Capitalized swap interest, net of tax		30,000	[5]			30,000								30,000
Adoption of ASU 2018-02		(1,148,000)	[6]								1,148,000			(1,148,000)
Restricted stock activity (in shares)																14,556
Restricted stock activity		(1,447,000)				(1,447,000)										$ (1,447,000)
Repurchase of common shares (in shares)																(475,920)
Repurchase of common shares		(57,267,000)				(57,267,000)										$ (57,267,000)
Contributions to joint ventures		99,646,000															99,646,000
Share of investee's other comprehensive income, net of tax of $285	[7]	0
Stock plan activity (in shares)									211,220
Stock plan activity		19,934,000				19,934,000			$ 3,000	19,931,000
Balance at the end of the period (in shares) at Dec. 31, 2018									43,511,473
Balance at the end of the period at Dec. 31, 2018		3,238,126,000				3,132,212,000			$ 436,000	3,322,433,000	(120,341,000)			(8,126,000)		$ (62,190,000)	105,914,000
Balance at the end of the period (in shares) at Dec. 31, 2018																(519,849)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		74,295,000				73,956,000					73,956,000						339,000
Interest rate swaps, net of tax		(21,184,000)	[3]			(21,184,000)								(21,184,000)
Pension adjustment, net of tax		11,000	[4]			11,000								11,000
Capitalized swap interest, net of tax		(73,000)	[5]			(73,000)								(73,000)
Adoption of ASU 2018-02	[6]	0
Deconsolidation of noncontrolling interests																			$ (3,750,000)	$ (3,750,000)		$ (2,538,000)	$ (2,538,000)
Restricted stock activity (in shares)									927							34,411
Restricted stock activity		(4,417,000)				(4,417,000)										$ (4,417,000)
Repurchase of common shares (in shares)																(496,000)
Repurchase of common shares		(53,923,000)				(53,923,000)										$ (53,923,000)
Contributions to joint ventures		84,890,000															84,890,000
Share of investee's other comprehensive income, net of tax of $285	[7]	$ 0
Accounting Standards Update [Extensible List]		us-gaap:AccountingStandardsUpdate201613Member
Stock plan activity (in shares)									123,493
Stock plan activity		$ 21,551,000				21,551,000			$ 1,000	21,550,000
Balance at the end of the period (in shares) at Dec. 31, 2019									43,635,893
Balance at the end of the period at Dec. 31, 2019		3,332,988,000		$ (18,000)	[8]	3,148,133,000	$ (18,000)	[8]	$ 437,000	3,343,983,000	(46,385,000)	$ (18,000.0)	[8]	(29,372,000)		$ (120,530,000)	184,855,000
Balance at the end of the period (in shares) at Dec. 31, 2019																(1,050,260)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		(3,173,000)
Net income(loss), excluding $22,881 attributable to redeemable noncontrolling interest		(26,054,000)				(26,154,000)					(26,154,000)						100,000
Interest rate swaps, net of tax		(23,070,000)	[3]			(23,070,000)								(23,070,000)
Pension adjustment, net of tax		(84,000)	[4]			(84,000)								(84,000)
Capitalized swap interest, net of tax	[5]	0
Adoption of ASU 2018-02	[6]	0
Reclassification of redeemable noncontrolling interest to temporary equity		(6,091,000)															(6,091,000)
Share of investee's other comprehensive income, net of tax of $285		1,002,000	[7]			1,002,000								1,002,000
Derecognition of 110 North Wacker, net of tax of $951	[9]	(165,509,000)				12,935,000					1,000			12,934,000			(178,444,000)
Common stock issued (in shares)									12,270,900
Issuance of common shares						593,616,000			$ 123,000	593,493,000												$ 593,616,000
Stock plan activity (in shares)									136,021							20,298
Stock plan activity		8,243,000				8,243,000			$ 2,000	9,802,000						$ (1,561,000)
Balance at the end of the period (in shares) at Dec. 31, 2020									56,042,814
Balance at the end of the period at Dec. 31, 2020		$ 3,715,023,000				$ 3,714,603,000			$ 562,000	$ 3,947,278,000	$ (72,556,000)			$ (38,590,000)		$ (122,091,000)	$ 420,000
Balance at the end of the period (in shares) at Dec. 31, 2020																(1,070,558)

[1] Excludes redeemable noncontrolling interest, which is reflected in temporary equity. See Note 3 - Acquisitions and Dispositions.

[2] Related to the adoption of ASU 2014-09, Revenues from Contracts with Customers (Topic 606) and all its related amendments as of January 1, 2018.

[3] Amounts are shown net of deferred tax benefit of $5.3 million for the year ended December 31, 2020, $6.2 million for the year ended December 31, 2019, and $0.3 million for the year ended December 31, 2018.

[4] The deferred tax impact is not meaningful for the years ended December 31, 2020 and 2019. Amount is net of deferred tax expense of $0.5 million for the year ended December 31, 2018.

[5] The deferred tax impact was not meaningful for the years ended December 31, 2020, 2019 and 2018.

[6] The Company adopted Accounting Standards Update (ASU) 2018-02, Income Statement-Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income, as of January 1, 2018.

[7] The amount for 2020 is shown net of deferred tax expense of $0.3 million.

[8] Related to the adoption of ASU 2016-13, Financial Instruments-Credit Losses (Topic 326) and all its related amendments as of January 1, 2020.

[9] Related to deconsolidation of 110 North Wacker. Refer to Note 3 - Acquisitions and Dispositions for additional information.