Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash Flows From Operating Activities:
Net income	$ 6,228	$ 3,513
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Straight-line rental income	(3,394)	(4,631)
Noncash operating lease expense	82	212
Depreciation	18,330	20,404
Amortization	5,330	6,351
Noncash compensation expense	4,657	1,539
Noncash interest expense	642	640
Income from unconsolidated joint ventures	(2,656)	(1,771)
Distributions of earnings from unconsolidated joint ventures	6,996	6,161
Gain on sale of real estate assets	(13,344)	0
Market value adjustment to investment in Real Estate Funds	160	0
Changes in assets and liabilities, net of acquisitions and dispositions:
Increase in tenant receivables, net	(1,702)	(294)
Decrease (increase) in prepaid expenses and other assets	(235)	3,563
Decrease in accounts payable and accrued expenses	(4,605)	(2,701)
Increase (decrease) in deferred income	(342)	2,093
Net cash provided by operating activities	16,147	35,079
Cash Flows From Investing Activities:
Net proceeds from the sale of real estate	250,822	0
Normandy Acquisition (Note 3)	(13,971)	0
Prepaid transaction costs and earnest money	0	(13,701)
Capital improvement and development costs	(23,583)	(19,014)
Deferred lease costs paid	(3,965)	(1,937)
Investments in unconsolidated joint ventures	(43,641)	(6,528)
Investments in Real Estate Funds	(253)	0
Distributions from unconsolidated joint ventures	6,487	5,672
Net cash provided by (used in) investing activities	171,896	(35,508)
Cash Flows From Financing Activities:
Financing costs paid	(5)	(21)
Proceeds from lines of credit and notes payable	347,000	74,000
Repayments of lines of credit and notes payable	(180,000)	(23,000)
Contributions from noncontrolling interest in consolidated joint venture	16	0
Distributions paid to stockholders	(48,384)	(46,716)
Distributions paid to noncontrolling interest in Columbia Operating Partnership	(685)	0
Redemptions of common stock	(25,474)	(2,401)
Net cash provided by financing activities	92,468	1,862
Net increase (decrease) in cash and cash equivalents	280,511	1,433
Cash and cash equivalents, beginning of period	12,303	17,118
Cash and cash equivalents, end of period	$ 292,814	$ 18,551