Supplemental Cash Flow Disclosures (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Supplemental disclosures:
Cash paid for interest			$ 176,694	$ 203,438
Cash paid for income taxes			5,601	4,474
Non-cash investing and financing activities:
Accrued capital expenditures, tenant improvements and real estate developments			8,831	13,670
Real estate contributions to industrial partnership and office partnership			17,240	29,577
Distributions declared and unpaid			85,421	150,970
Distributions payable relinquished		$ 6,429	0	7,799
Surrender of Limited Partner OP Units	$ 191,974	$ 26,537	0	191,974
Mortgage note payable relieved by foreclosure or a deed-in-lieu of foreclosure			0	19,525
Real estate investments received from lease related transactions			259	0
Exchange of real estate investments			$ 0	$ 8,900