Supplemental Cash Flow Disclosures (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Supplemental disclosures:
Cash paid for interest	$ 118,443	$ 126,173
Cash paid for income taxes	3,555	3,885
Non-cash investing and financing activities:
Accrued capital expenditures, tenant improvements and real estate developments	18,205	13,513
Real estate contributions to industrial partnership and office partnership	0	7,494
Distributions declared and unpaid	106,999	85,231
Real estate investments received from lease related transactions	4,076	259
Note receivable for disposal of real estate investments	$ 4,500	$ 0