Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities
Net income	$ 109,511	$ 95,948
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization expense	49,582	49,643
Tenant improvement reimbursement amortization, net of lease incentive amortization	(392)	(663)
Gain on sale of real estate facility	(19,621)
Stock compensation expense	1,873	1,889
Amortization of financing costs	273	272
Other, net	1,095	(5,920)
Total adjustments	32,810	45,221
Net cash provided by operating activities	142,321	141,169
Cash flows from investing activities
Capital expenditures to real estate facilities	(16,038)	(17,503)
Capital expenditures to land and building held for development	(4,995)	(993)
Acquisition of real estate facility	(13,423)	(13,736)
Proceeds from sale of real estate facility	29,266
Net cash used in investing activities	(5,190)	(32,232)
Cash flows from financing activities
Payment of financing costs	(176)	(157)
Proceeds from the exercise of stock options	259	709
Cash paid for taxes in lieu of shares upon vesting of restricted stock units	(3,660)	(5,500)
Cash paid to restricted stock unit holders	(329)	(480)
Distributions paid to preferred shareholders	(24,093)	(25,918)
Distributions paid to common shareholders	(57,673)	(57,538)
Distributions paid to noncontrolling interests - common units	(15,341)	(15,341)
Distributions paid to noncontrolling interests - joint venture	(63)	(45)
Net cash used in financing activities	(101,076)	(104,270)
Net increase in cash and cash equivalents	36,055	4,667
Cash, cash equivalents and restricted cash at the beginning of the period	63,874	38,467
Cash, cash equivalents and restricted cash at the end of the period	$ 99,929	43,134
Adjustment to noncontrolling interests- common units in the OP
Noncontrolling interests- common units		(1,028)
Paid-in capital		$ 1,028