INTERIM CONSOLIDATED STATEMENTS OF CASH FLOW - USD ($) $ in Thousands	3 Months Ended				6 Months Ended		15 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019
Cash flow from operating activities:
Net income (loss)	$ 7,535	$ 21,148	$ (6,433)	$ (252)	$ 28,683	$ (6,685)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization					77,019	70,804
Amortization of above and below market leases	100		100		121	270
Amortization of deferred loan costs	1,000		1,000		1,957	1,923	$ 1,000
Equity in (earnings) loss of unconsolidated entity	(401)				(675)
Equity-based compensation expense					7,596	7,480
Bad debt expense (recoveries)					250	(1,230)
(Gain) loss on sale of assets, net					(13,408)	2,846
Deferred tax expense (benefit)					197	(2,443)
Restructuring costs, net of cash paid						10,065
Foreign currency remeasurement (gain) loss					40
Changes in operating assets and liabilities
Rents and other receivables, net					(1,998)	(1,914)
Prepaid expenses					35	(3,925)
Due from affiliates					7,314
Other assets					(425)	1,867
Accounts payable and accrued liabilities					(11,815)	3,535
Advance rents, security deposits and other liabilities					(3,601)	1,369
Deferred income					6,791	7,564
Net cash provided by operating activities					99,431	91,526
Cash flow from investing activities:
Proceeds from sale of property, net					52,722	1,496
Acquisitions, net of cash acquired					(44,150)	(24,626)
Additions to property and equipment					(205,487)	(248,852)
Net cash used in investing activities					(196,915)	(271,982)
Cash flow from financing activities:
Credit facility proceeds					213,311	231,000
Credit facility repayments					(210,000)	(362,000)
Payment of deferred financing costs					(141)	(606)
Payment of preferred stock dividends					(14,090)	(635)
Payment of common stock dividends					(45,332)	(40,641)
Distribution to noncontrolling interests					(5,669)	(5,289)
Proceeds from exercise of stock options					3,357	18
Payment of tax withholdings related to equity-based awards					(2,523)	(1,233)
Principal payments on finance lease obligations					(1,560)	(4,316)
Mortgage principal debt repayments					(26)	(32)
Preferred stock issuance proceeds, net of costs				103,200		408,415
Common stock issuance proceeds, net of costs					159,026
Net cash provided by financing activities					96,353	224,681
Effect of foreign currency exchange rates on cash and cash equivalents					9
Net increase (decrease) in cash and cash equivalents					(1,122)	44,225
Cash and cash equivalents, beginning of period		11,759		8,243	11,759	8,243
Cash and cash equivalents, end of period	10,638		52,468		10,638	52,468	10,638
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Cash paid for interest (excluding deferred financing costs and amounts capitalized)					27,828	25,647
Noncash investing and financing activities:
Accrued capital additions					43,780	67,708
Net increase (decrease) in other assets/liabilities related to change in fair value of derivative contracts					(28,459)	8,545
Equity received in unconsolidated entity in exchange for real estate assets					25,280
Increase in assets in exchange for finance lease obligation					45,024
Accrued equity issuance costs					385	777
Accrued preferred stock dividend					5,938	2,576
Accrued deferred financing costs						14
Qualitytech, LP
Cash flow from operating activities:
Net income (loss)	7,535	21,148	(6,433)	(252)	28,683	(6,685)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization					77,019	70,804
Amortization of above and below market leases					121	270
Amortization of deferred loan costs					1,957	1,923
Equity in (earnings) loss of unconsolidated entity	(401)				(675)
Equity-based compensation expense					7,596	7,480
Bad debt expense (recoveries)					250	(1,230)
(Gain) loss on sale of assets, net					(13,408)	2,846
Deferred tax expense (benefit)					197	(2,443)
Restructuring costs, net of cash paid						10,065
Foreign currency remeasurement (gain) loss					40
Changes in operating assets and liabilities
Rents and other receivables, net					(1,998)	(1,914)
Prepaid expenses					35	(3,925)
Due from affiliates					7,314
Other assets					(425)	1,867
Accounts payable and accrued liabilities					(11,815)	3,535
Advance rents, security deposits and other liabilities					(3,601)	1,369
Deferred income					6,791	7,564
Net cash provided by operating activities					99,431	91,526
Cash flow from investing activities:
Proceeds from sale of property, net					52,722	1,496
Acquisitions, net of cash acquired					(44,150)	(24,626)
Additions to property and equipment					(205,487)	(248,852)
Net cash used in investing activities					(196,915)	(271,982)
Cash flow from financing activities:
Credit facility proceeds					213,311	231,000
Credit facility repayments					(210,000)	(362,000)
Payment of deferred financing costs					(141)	(606)
Payment of preferred stock dividends					(14,090)	(635)
Payment of cash dividends					(45,332)	(40,641)
Partnership distributions					(5,669)	(5,289)
Proceeds from exercise of stock options					3,357	18
Payment of tax withholdings related to equity-based awards					(2,523)	(1,233)
Principal payments on finance lease obligations					(1,560)	(4,316)
Mortgage principal debt repayments					(26)	(32)
Preferred stock issuance proceeds, net of costs						408,415
Common stock issuance proceeds, net of costs					159,026
Net cash provided by financing activities					96,353	224,681
Effect of foreign currency exchange rates on cash and cash equivalents					9
Net increase (decrease) in cash and cash equivalents					(1,122)	44,225
Cash and cash equivalents, beginning of period		$ 11,759		$ 8,243	11,759	8,243
Cash and cash equivalents, end of period	$ 10,638		$ 52,468		10,638	52,468	$ 10,638
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Cash paid for interest (excluding deferred financing costs and amounts capitalized)					27,828	25,647
Noncash investing and financing activities:
Accrued capital additions					43,780	67,708
Net increase (decrease) in other assets/liabilities related to change in fair value of derivative contracts					(28,459)	8,545
Equity received in unconsolidated entity in exchange for real estate assets					25,280
Increase in assets in exchange for finance lease obligation					45,024
Accrued equity issuance costs					385	777
Accrued preferred stock dividend					$ 5,938	2,576
Accrued deferred financing costs						$ 14