Condensed Consolidated Statements of Cash Flows - Supplemental Information (Supplemental Information) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Supplemental Cash Flow Elements [Abstract]
Interest paid	$ 27,288	$ 31,601
Non-Cash Activity:
Transfers from projects under development to operating properties	95,185	0
Common stock dividends declared and accrued	44,563	30,492
Transfer from land held and other assets to projects under development	29,121	0
Change in accrued property, acquisition, development, and tenant expenditures	13,845	11,085
Ground lease right-of-use assets and associated liabilities	0	56,294
Non-cash consideration for property acquisition	$ 0	$ 10,071