EQUITY - Changes in Common Stock (Details) - shares	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Changes in Common Stock [Roll Forward]
Beginning common shares outstanding	105,169,515	104,783,179
Grants under the Equity Plan	676,171	537,734
Common Unit redemptions	33,579	6,076
Performance share and other forfeitures	(210,897)	(166,478)
Shares retained for employee tax withholding requirements	(65,345)	(74,340)
Ending common shares outstanding	105,696,833	105,126,626
Annual grants to independent directors
Changes in Common Stock [Roll Forward]
Grants under the Equity Plan	93,810	40,455