Supplemental Cash Flow Disclosures (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Supplemental disclosures:
Cash paid for interest	$ 281,490	$ 267,400	$ 260,951
Cash paid for income taxes	5,019	5,589	11,280
Cash received from federal income tax refund	0	2,939	16,686
Non-cash investing and financing activities:
Accrued capital expenditures, tenant improvements and real estate developments	13,412	12,648	6,578
Accrued deferred financing costs	1,100	67	0
Real estate contributions to Industrial Partnership	29,577	0	0
Distributions declared and unpaid	150,365	148,383	149,768
Distributions payable relinquished	12,522	0	0
Mortgage note payable relieved by foreclosure or a deed-in-lieu of foreclosure	19,525	16,200	100,388
Mortgage notes payable assumed in real estate disposition	0	0	66,000
Real estate investments received from a ground lease expiration and other lease related transactions	3,800	1,386	259
Real estate investments received from a property-related legal settlement	0	0	775
Establishment of right-of-use assets and lease liabilities	236,286	0	0
Nonmonetary exchanges:
Exchange of real estate investments	8,900	0	50,204
Real estate investments relinquished and gain on disposition	0	0	(47,474)
Rent and tenant receivables, intangible lease liability and other assets, net	$ 0	$ 0	$ (2,511)