INTERIM CONSOLIDATED STATEMENTS OF EQUITY - USD ($) shares in Thousands, $ in Thousands	Series A Preferred Stock Qualitytech, LP Preferred stock Limited Partner	Series A Preferred Stock Qualitytech, LP Common stock Limited Partner	Series A Preferred Stock Qualitytech, LP	Series A Preferred Stock Preferred stock	Series A Preferred Stock Accumulated dividends in excess of earnings	Series A Preferred Stock Total stockholders' Equity	Series A Preferred Stock	Series B Preferred Stock Qualitytech, LP Preferred stock Limited Partner	Series B Preferred Stock Qualitytech, LP Common stock Limited Partner	Series B Preferred Stock Qualitytech, LP	Series B Preferred Stock Preferred stock	Series B Preferred Stock Accumulated dividends in excess of earnings	Series B Preferred Stock Total stockholders' Equity	Series B Preferred Stock	Qualitytech, LP Preferred stock Limited Partner	Qualitytech, LP Common stock Limited Partner	Qualitytech, LP Common stock General Partner	Qualitytech, LP Accumulated other comprehensive income (loss)	Qualitytech, LP	Preferred stock	Common stock	Additional paid-in capital	Accumulated other comprehensive income (loss)	Accumulated dividends in excess of earnings	Total stockholders' Equity	Noncontrolling interests	Total
Beginning balance at Dec. 31, 2017																$ 989,207	$ 1	$ 1,449	$ 990,656		$ 507	$ 1,049,176	$ 1,283	$ (173,552)	$ 877,414	$ 113,242	$ 990,656
Beginning balance, shares at Dec. 31, 2017																57,246					50,702
Net share activity through equity award plan																$ (238)			(238)		$ 4	(1,311)			(1,307)	1,069	(238)
Net share activity through equity award plan, shares																564					434
Increase (decrease) in fair value of derivative contracts																		5,982	5,982				5,290		5,290	692	5,982
Equity-based compensation expense																$ 4,898			4,898			4,337			4,337	561	4,898
Proceeds net of fees from common equity offering	$ 103,184		$ 103,184	$ 103,184		$ 103,184	$ 103,184
Proceeds net of fees from common equity offering (in shares)	4,280			4,280
Dividends declared on Preferred Stock		$ (328)	(328)		$ (328)	(328)	(328)
Dividends declared to common shareholders																(20,971)			(20,971)					(20,971)	(20,971)		(20,971)
Dividends declared to noncontrolling interests																										(2,736)	(2,736)
Partnership distributions																(2,736)			(2,736)
Net income (loss)																(252)			(252)					(223)	(223)	(29)	(252)
Ending balance at Mar. 31, 2018															$ 103,184	$ 969,580	1	7,431	1,080,195	$ 103,184	$ 511	1,052,202	6,573	(195,074)	967,396	112,799	1,080,195
Ending balance, shares at Mar. 31, 2018															4,280	57,810				4,280	51,136
Beginning balance at Dec. 31, 2017																$ 989,207	1	1,449	990,656		$ 507	1,049,176	1,283	(173,552)	877,414	113,242	990,656
Beginning balance, shares at Dec. 31, 2017																57,246					50,702
Increase (decrease) in fair value of derivative contracts																			9,974								9,974
Dividends declared on Preferred Stock																			(9,621)								(9,621)
Net income (loss)																			(13,577)								(13,577)
Ending balance at Sep. 30, 2018															$ 407,477	$ 908,327	1	11,423	1,327,227	$ 407,477	$ 511	1,059,914	10,103	(257,019)	1,220,986	106,241	1,327,227
Ending balance, shares at Sep. 30, 2018															7,443	57,801				7,443	51,124
Beginning balance at Mar. 31, 2018															$ 103,184	$ 969,580	1	7,431	1,080,195	$ 103,184	$ 511	1,052,202	6,573	(195,074)	967,396	112,799	1,080,195
Beginning balance, shares at Mar. 31, 2018															4,280	57,810				4,280	51,136
Net share activity through equity award plan																$ (624)			(624)			(586)			(586)	(38)	(624)
Net share activity through equity award plan, shares																8					5
Increase (decrease) in fair value of derivative contracts																		2,563	2,563				2,267		2,267	296	2,563
Equity-based compensation expense																$ 5,710			5,710			5,051			5,051	659	5,710
Adjustment to expenses net	$ 28		28	$ 28		28	28
Proceeds net of fees from common equity offering								$ 304,426		$ 304,426	$ 304,426		$ 304,426	$ 304,426
Proceeds net of fees from common equity offering (in shares)								3,163			3,163
Dividends declared on Preferred Stock		(1,905)	(1,905)		(1,905)	(1,905)	(1,905)		$ (343)	(343)		$ (343)	(343)	(343)
Dividends declared to common shareholders																(20,971)			(20,971)					(20,971)	(20,971)		(20,971)
Dividends declared to noncontrolling interests																										(2,736)	(2,736)
Partnership distributions																(2,736)			(2,736)
Net income (loss)																(6,433)			(6,433)					(5,431)	(5,431)	(1,002)	(6,433)
Ending balance at Jun. 30, 2018															$ 407,638	$ 942,278	1	9,994	1,359,910	$ 407,638	$ 511	1,056,667	8,840	(223,724)	1,249,932	109,978	1,359,910
Ending balance, shares at Jun. 30, 2018															7,443	57,818				7,443	51,141
Net share activity through equity award plan																$ (272)			(272)			(256)			(256)	(16)	(272)
Net share activity through equity award plan, shares																(17)					(17)
Increase (decrease) in fair value of derivative contracts																		1,429	1,429				1,263		1,263	166	1,429
Equity-based compensation expense																$ 3,961			3,961			3,503			3,503	458	3,961
Adjustment to expenses net								$ (161)		(161)	$ (161)		(161)	(161)
Dividends declared on Preferred Stock		(1,907)	(1,907)		(1,907)	(1,907)	(1,907)		(5,139)	(5,139)		(5,139)	(5,139)	(5,139)					(7,045)								(7,045)
Dividends declared to common shareholders																(20,967)			(20,967)					(20,967)	(20,967)		(20,967)
Dividends declared to noncontrolling interests																										(2,735)	(2,735)
Partnership distributions																(2,735)			(2,735)
Net income (loss)																(6,892)			(6,892)					(5,282)	(5,282)	(1,610)	(6,892)
Ending balance at Sep. 30, 2018															$ 407,477	$ 908,327	1	11,423	1,327,227	$ 407,477	$ 511	1,059,914	10,103	(257,019)	1,220,986	106,241	1,327,227
Ending balance, shares at Sep. 30, 2018															7,443	57,801				7,443	51,124
Beginning balance at Dec. 31, 2018															$ 407,477	$ 886,866	1	2,344	1,296,687	$ 407,477	$ 511	1,062,473	2,073	(278,548)	1,193,986	102,701	1,296,687
Beginning balance, shares at Dec. 31, 2018															7,443	57,799				7,443	51,123
Partners' Capital, Beginning Balance at Dec. 31, 2018																			1,296,687
Net share activity through equity award plan																$ 741			741		$ 3	660			663	78	741
Net share activity through equity award plan, shares																229					231
Increase (decrease) in fair value of derivative contracts																		(9,853)	(9,853)				(8,775)		(8,775)	(1,078)	(9,853)
Equity-based compensation expense																$ 3,300			3,300			2,928			2,928	372	3,300
Net cumulative effect upon ASC 842 adoption																(1,813)			(1,813)					(1,813)	(1,813)		(1,813)
Adjustment to expenses net								$ (42)		(42)	$ (42)		(42)	(42)
Proceeds net of fees from common equity offering																$ 158,663			158,663		$ 40	148,650			148,690	9,973	158,663
Proceeds net of fees from common equity offering (in shares)																4,000					4,000
Dividends declared on Preferred Stock		(1,906)	(1,906)		(1,906)	(1,906)	(1,906)		(5,139)	(5,139)		(5,139)	(5,139)	(5,139)
Dividends declared to common shareholders																$ (24,371)			(24,371)					(24,371)	(24,371)		(24,371)
Dividends declared to noncontrolling interests																										(2,935)	(2,935)
Partnership distributions																(2,935)			(2,935)
Net income (loss)																21,148			21,148					19,558	19,558	1,590	21,148
Ending balance at Mar. 31, 2019															$ 407,435	$ 1,034,554	1	(7,509)	1,434,480	$ 407,435	$ 554	1,214,711	(6,702)	(292,219)	1,323,779	110,701	1,434,480
Ending balance, shares at Mar. 31, 2019															7,443	62,028				7,443	55,354
Beginning balance at Dec. 31, 2018															$ 407,477	$ 886,866	1	2,344	1,296,687	$ 407,477	$ 511	1,062,473	2,073	(278,548)	1,193,986	102,701	1,296,687
Beginning balance, shares at Dec. 31, 2018															7,443	57,799				7,443	51,123
Partners' Capital, Beginning Balance at Dec. 31, 2018																			1,296,687
Increase (decrease) in fair value of derivative contracts																			(34,192)								(34,192)
Foreign currency translation adjustments																			(360)								(360)
Dividends declared on Preferred Stock																			(21,135)								(21,135)
Net income (loss)																			35,271								35,271
Ending balance at Sep. 30, 2019															$ 407,435	$ 1,098,651	1	(32,274)	1,473,812	$ 407,435	$ 582	1,326,087	(28,900)	(340,943)	1,364,261	109,551	1,473,812
Ending balance, shares at Sep. 30, 2019															7,443	64,906				7,443	58,238
Partners' Capital, Ending Balance at Sep. 30, 2019																			1,473,812
Beginning balance at Mar. 31, 2019															$ 407,435	$ 1,034,554	1	(7,509)	1,434,480	$ 407,435	$ 554	1,214,711	(6,702)	(292,219)	1,323,779	110,701	1,434,480
Beginning balance, shares at Mar. 31, 2019															7,443	62,028				7,443	55,354
Net share activity through equity award plan																$ 179			179			505			505	(326)	179
Net share activity through equity award plan, shares																31					37
Increase (decrease) in fair value of derivative contracts																		(18,606)	(18,606)				(16,608)		(16,608)	(1,998)	(18,606)
Equity-based compensation expense																$ 4,296			4,296			3,832			3,832	464	4,296
Dividends declared on Preferred Stock		(1,906)	(1,906)		(1,906)	(1,906)	(1,906)		(5,139)	(5,139)		(5,139)	(5,139)	(5,139)
Dividends declared to common shareholders																(24,377)			(24,377)					(24,377)	(24,377)		(24,377)
Dividends declared to noncontrolling interests																										(2,932)	(2,932)
Partnership distributions																(2,932)			(2,932)
Net income (loss)																7,535			7,535					7,483	7,483	52	7,535
Ending balance at Jun. 30, 2019															$ 407,435	$ 1,012,210	1	(26,115)	1,393,530	$ 407,435	$ 554	1,219,048	(23,310)	(316,158)	1,287,569	105,961	1,393,530
Ending balance, shares at Jun. 30, 2019															7,443	62,059				7,443	55,391
Net share activity through equity award plan																$ 260			260			239			239	21	260
Net share activity through equity award plan, shares																15					15
Increase (decrease) in fair value of derivative contracts																		(5,733)	(5,733)				(5,207)		(5,207)	(526)	(5,733)
Foreign currency translation adjustments																		(426)	(426)				(383)		(383)	(43)	(426)
Equity-based compensation expense																$ 4,457			4,457			3,979			3,979	478	4,457
Proceeds net of fees from settlement of forward shares																$ 109,490			109,490		$ 28	102,821			102,849	6,641	109,490
Proceeds net of fees from settlement of forward shares (in shares)																2,832					2,832
Dividends declared on Preferred Stock		$ (1,906)	$ (1,906)		$ (1,906)	$ (1,906)	$ (1,906)		$ (5,139)	$ (5,139)		$ (5,139)	$ (5,139)	$ (5,139)					(7,045)								(7,045)
Dividends declared to common shareholders																$ (24,377)			(24,377)					(24,377)	(24,377)		(24,377)
Dividends declared to noncontrolling interests																										(2,932)	(2,932)
Partnership distributions																(2,932)			(2,932)
Net income (loss)																6,588			6,588					6,637	6,637	(49)	6,588
Ending balance at Sep. 30, 2019															$ 407,435	$ 1,098,651	$ 1	$ (32,274)	1,473,812	$ 407,435	$ 582	$ 1,326,087	$ (28,900)	$ (340,943)	$ 1,364,261	$ 109,551	$ 1,473,812
Ending balance, shares at Sep. 30, 2019															7,443	64,906				7,443	58,238
Partners' Capital, Ending Balance at Sep. 30, 2019																			$ 1,473,812