CONSOLIDATED STATEMENTS OF CASH FLOW - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flow from operating activities:
Net income (loss)	$ (3,606)	$ 31,665	$ (7,175)	$ 1,457
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization		160,528	143,354	136,585
Amortization of above and below market leases		187	465	865
Amortization of deferred loan costs		3,877	3,856	3,640
Amortization of senior notes discount				229
Distributions from unconsolidated entity		3,280
Equity in (earnings) loss of unconsolidated entity		1,473
Loss on extinguishment of debt				19,912
Equity-based compensation expense		16,412	14,972	13,863
Bad debt expense (recoveries)		2,406	(2,275)	3,519
Write off of deferred loan costs		1,532	605	80
Deferred tax expense (benefit)		(348)	(2,970)	(10,742)
(Gain) loss on sale of assets, net		(14,769)	6,994
Integration, impairment & restructuring costs		11,462	19,575	9,027
Foreign currency remeasurement (gain) loss		50
Changes in operating assets and liabilities
Rents and other receivables, net		(27,234)	(6,495)	(12,881)
Prepaid expenses		(3,406)	(3,063)	755
Due to/from affiliates, net		9,284
Other assets		35	4,518	282
Accounts payable and accrued liabilities		2,973	8,573	(5,071)
Advance rents, security deposits and other liabilities		(5,845)	2,069	5,491
Deferred income		5,928	8,270	3,312
Net cash provided by operating activities		199,490	191,273	170,323
Cash flow from investing activities:
Proceeds from sale of property		54,427	2,779
Acquisitions, net of cash acquired		(76,383)	(117,029)	(127,038)
Investments in unconsolidated entity		4,144
Additions to property and equipment		(361,160)	(484,303)	(307,314)
Net cash used in investing activities		(387,260)	(598,553)	(434,352)
Cash flow from financing activities:
Credit facility proceeds		399,028	483,000	888,000
Credit facility repayments		(334,000)	(362,000)	(696,000)
Debt Proceeds				1,920
5.75% Senior Notes Repayment				(300,000)
4.75% Notes Issuance				400,000
Payment of debt extinguishment costs				(13,218)
Payment of deferred financing costs		(5,130)	(3,964)	(10,862)
Payment of preferred stock dividends		(28,180)	(10,728)
Payment of common stock dividends		(94,085)	(82,579)	(74,592)
Distribution to noncontrolling interests		(11,533)	(10,759)	(10,289)
Proceeds from exercise of stock options		3,857	246	4,972
Payment of tax withholdings related to equity based awards		(3,900)	(2,205)	(4,725)
Principal payments on finance lease obligations		(2,855)	(7,626)	(12,224)
Mortgage principal debt repayments		(65)	(66)	(54)
Preferred stock issuance proceeds, net of costs			407,477
Common stock issuance proceeds, net of costs		268,259		107,549
Net cash provided by financing activities		191,396	410,796	262,692
Effect of foreign currency exchange rates on cash and cash equivalents		268
Net change in cash and cash equivalents		3,894	3,516	(1,337)
Cash and cash equivalents, beginning of period		11,759	8,243	9,580
Cash and cash equivalents, end of period	15,653	15,653	11,759	8,243
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Cash paid for interest (excluding deferred financing costs and amounts capitalized)		56,023	51,380	44,357
Noncash investing and financing activities:
Accrued capital additions		92,206	76,890	75,965
Net increase (decrease) in derivative liabilities related to change in fair value of derivative contracts		(28,952)	895
Equity received in unconsolidated entity in exchange for real estate assets		25,280
Accrued preferred stock dividends		5,938	5,938
Accrued deferred financing costs			76	458
Accrued equity issuance costs		30	115	25
Acquisitions, net of cash acquired:
Land	1,743	1,743		9,363
Buildings, improvements and equipment	8,640	8,640	445	14,341
Construction in Progress	61,514	61,514	114,283	103,334
Rents and other receivables, net	1,239	1,239
Acquired intangibles, net	2,628	2,628	2,301
Deferred costs	906	906
Prepaid expenses	359	359
Other assets	128	128
Accounts payable and accrued liabilities	(52)	(52)
Advance rents, security deposits and other liabilities	(722)	(722)
Total acquisitions, net of cash acquired		76,383	117,029	127,038
Dulles, Virginia
Cash flow from financing activities:
Principal payments on finance lease obligations				(17,785)
Qualitytech, LP
Cash flow from operating activities:
Net income (loss)	(3,606)	31,665	(7,175)	1,457
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization		160,528	143,354	136,585
Amortization of above and below market leases		187	465	865
Amortization of deferred loan costs		3,877	3,856	3,640
Amortization of senior notes discount				229
Distributions from unconsolidated entity		3,280
Equity in (earnings) loss of unconsolidated entity		1,473
Loss on extinguishment of debt				19,912
Equity-based compensation expense		16,412	14,972	13,863
Bad debt expense (recoveries)		2,406	(2,275)	3,519
Write off of deferred loan costs		1,532	605	80
Deferred tax expense (benefit)		(348)	(2,970)	(10,742)
(Gain) loss on sale of assets, net		(14,769)	6,994
Integration, impairment & restructuring costs		11,462	19,575	9,027
Foreign currency remeasurement (gain) loss		50
Changes in operating assets and liabilities
Rents and other receivables, net		(27,234)	(6,495)	(12,881)
Prepaid expenses		(3,406)	(3,063)	755
Due to/from affiliates, net		9,284
Other assets		35	4,518	282
Accounts payable and accrued liabilities		2,973	8,573	(5,071)
Advance rents, security deposits and other liabilities		(5,845)	2,069	5,491
Deferred income		5,928	8,270	3,312
Net cash provided by operating activities		199,490	191,273	170,323
Cash flow from investing activities:
Proceeds from sale of property		54,427	2,779
Acquisitions, net of cash acquired		(76,383)	(117,029)	(127,038)
Investments in unconsolidated entity		4,144
Additions to property and equipment		(361,160)	(484,303)	(307,314)
Net cash used in investing activities		(387,260)	(598,553)	(434,352)
Cash flow from financing activities:
Credit facility proceeds		399,028	483,000	888,000
Credit facility repayments		(334,000)	(362,000)	(696,000)
Debt Proceeds				1,920
5.75% Senior Notes Repayment				(300,000)
4.75% Notes Issuance				400,000
Payment of debt extinguishment costs				(13,218)
Payment of deferred financing costs		(5,130)	(3,964)	(10,862)
Payment of preferred stock dividends		(28,180)	(10,728)
Payment of cash dividends		(94,085)	(82,579)	(74,592)
Partnership distributions		(11,533)	(10,759)	(10,289)
Proceeds from exercise of stock options		3,857	246	4,972
Payment of tax withholdings related to equity based awards		(3,900)	(2,205)	(4,725)
Principal payments on finance lease obligations		(2,855)	(7,626)	(12,224)
Mortgage principal debt repayments		(65)	(66)	(54)
Preferred stock issuance proceeds, net of costs			407,477
Common stock issuance proceeds, net of costs		268,259		107,549
Net cash provided by financing activities		191,396	410,796	262,692
Effect of foreign currency exchange rates on cash and cash equivalents		268
Net change in cash and cash equivalents		3,894	3,516	(1,337)
Cash and cash equivalents, beginning of period		11,759	8,243	9,580
Cash and cash equivalents, end of period	15,653	15,653	11,759	8,243
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Cash paid for interest (excluding deferred financing costs and amounts capitalized)		56,023	51,380	44,357
Noncash investing and financing activities:
Accrued capital additions		92,206	76,890	75,965
Net increase (decrease) in derivative liabilities related to change in fair value of derivative contracts		(28,952)	895
Equity received in unconsolidated entity in exchange for real estate assets		25,280
Accrued preferred stock dividends		5,938	5,938
Accrued deferred financing costs			76	458
Accrued equity issuance costs		30	115	25
Acquisitions, net of cash acquired:
Land	1,743	1,743		9,363
Buildings, improvements and equipment	8,640	8,640	445	14,341
Construction in Progress	61,514	61,514	114,283	103,334
Rents and other receivables, net	1,239	1,239
Acquired intangibles, net	2,628	2,628	2,301
Deferred costs	906	906
Prepaid expenses	359	359
Other assets	128	128
Accounts payable and accrued liabilities	(52)	(52)
Advance rents, security deposits and other liabilities	$ (722)	(722)
Total acquisitions, net of cash acquired		$ 76,383	$ 117,029	127,038
Qualitytech, LP | Dulles, Virginia
Cash flow from financing activities:
Principal payments on finance lease obligations				$ (17,785)