Condensed Consolidated Statements of Cash Flows - Supplemental Information - (Supplemental Information) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Supplemental Cash Flow Elements [Abstract]
Interest paid	$ 31,800	$ 22,130
Non-Cash Activity:
Transfers from projects under development to operating properties	277,097	0
Common stock dividends declared and accrued	44,570	42,563
Transfer from land held and other assets to projects under development	29,121	0
Change in accrued property, acquisition, development, and tenant expenditures	16,569	8,973
Non-cash assets and liabilities assumed in TIER transaction	0	1,512,384
Ground lease right-of-use assets and associated liabilities	0	56,294
Non-cash consideration for property acquisition	$ 0	$ 10,071