CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Series B Convertible Preferred Units Qualitytech, LP Common stock Limited Partner	Series B Convertible Preferred Units Qualitytech, LP	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, 2016																					$ 952,810		$ 478	$ 931,783		$ (97,793)	$ 834,468	$ 118,342	$ 952,810
Beginning balance, shares at Dec. 31, 2016																							47,831,000
Limited Partners' Capital, Beginning at Dec. 31, 2016																		$ 952,810
Limited Partners' Capital, Beginning balance, shares at Dec. 31, 2016																		54,628,000
Beginning balance, shares at Dec. 31, 2016																			1,000
Net share activity through equity award plan																		$ 1,022			1,022		$ 6	893			899	123	1,022
Net share activity through equity award plan, shares																		582,000					582,000
Stock Issued During Period, Shares, Conversion of Units																							253,000
Reclassification of noncontrolling interest upon conversion of partnership units to common stock																							$ 3	8,352			8,355	(8,355)
Increase (decrease) in fair value of derivative contracts																				$ 1,449	1,449				$ 1,283		1,283	166	1,449
Equity-based compensation expense																		$ 13,863			13,863			12,196			12,196	1,667	13,863
Proceeds net of fees from common equity offering																		$ 107,495			107,495		$ 20	95,952			95,972	11,523	107,495
Proceeds net of fees from common equity offering (in shares)																		2,036,000					2,036,000
Dividends declared to common stockholders																		$ (77,041)			(77,041)					(77,041)	(77,041)		(77,041)
Dividends declared to noncontrolling interests																												(10,399)	(10,399)
Partnership distributions																		(10,399)			(10,399)
Net income (loss)																		1,457			1,457					1,282	1,282	175	1,457
Ending balance at Dec. 31, 2017																				1,449	990,656		$ 507	1,049,176	1,283	(173,552)	877,414	113,242	990,656
Ending balance, shares at Dec. 31, 2017																							50,702,000
Limited Partners' Capital, Ending balance at Dec. 31, 2017																		$ 989,207
Limited Partners' Capital Ending balance, shares at Dec. 31, 2017																		57,246,000
Ending balance, shares at Dec. 31, 2017																			1,000
Net share activity through equity award plan																		$ (1,788)			(1,788)		$ 4	(2,717)			(2,713)	925	(1,788)
Net share activity through equity award plan, shares																		553,000					421,000
Increase (decrease) in fair value of derivative contracts																				895	895				790		790	105	895
Equity-based compensation expense																		$ 18,100			18,100			16,014			16,014	2,086	18,100
Proceeds net of fees from common equity offering			$ 103,212		$ 103,212	$ 103,212		$ 103,212	$ 103,212	$ 304,265		$ 304,265	$ 304,265		$ 304,265	$ 304,265
Proceeds net of fees from common equity offering (in shares)			4,280,000			4,280,000				3,163,000			3,163,000
Dividends declared on Preferred Stock																					(16,666)								(16,666)
Dividends declared on Preferred Units				$ (6,046)	(6,046)		$ (6,046)	(6,046)	(6,046)		$ (10,621)	$ (10,621)		$ (10,621)	(10,621)	(10,621)
Dividends declared to common stockholders																		(83,869)			(83,869)					(83,869)	(83,869)		(83,869)
Dividends declared to noncontrolling interests																												(10,942)	(10,942)
Partnership distributions																		(10,942)			(10,942)
Net income (loss)																		(7,175)			(7,175)					(4,460)	(4,460)	(2,715)	(7,175)
Ending balance at Dec. 31, 2018																				2,344	1,296,687	$ 407,477	$ 511	1,062,473	2,073	(278,548)	1,193,986	102,701	1,296,687
Ending balance, shares at Dec. 31, 2018																						7,443,000	51,123,000
Limited Partners' Capital, Ending balance at Dec. 31, 2018																	$ 407,477	$ 886,866
Limited Partners' Capital Ending balance, shares at Dec. 31, 2018																	7,443,000	57,799,000
Ending balance, shares at Dec. 31, 2018																			1,000
Partners' Capital, Ending Balance at Dec. 31, 2018																					1,296,687
Net cumulative effect upon ASC 842 adoption																		$ (1,813)			(1,813)					(1,813)	(1,813)		(1,813)
Net share activity through equity award plan																		$ 1,825			1,825		$ 3	1,816			1,819	6	1,825
Net share activity through equity award plan, shares																		270,000					273,000
Increase (decrease) in fair value of derivative contracts																				(29,843)	(29,843)				(26,745)		(26,745)	(3,098)	(29,843)
Foreign currency translation adjustments																				34	34				30		30	4	34
Equity-based compensation expense																		$ 16,413			16,413			14,651			14,651	1,762	16,413
Proceeds net of fees from settlement of forward shares																		$ 109,527			109,527		$ 28	102,854			102,882	6,645	109,527
Proceeds net of fees from settlement of forward shares (in shares)																		2,832,000					2,832,000
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)																		4,000,000					4,000,000
Dividends declared on Preferred Stock	$ (20,556)	$ (20,556)		$ (7,624)	$ (7,624)		$ (7,624)	$ (7,624)	$ (7,624)					$ (20,556)	$ (20,556)	$ (20,556)					(28,180)								(28,180)
Dividends declared to common stockholders																		$ (98,752)			(98,752)					(98,752)	(98,752)		(98,752)
Dividends declared to noncontrolling interests																												(11,733)	(11,733)
Partnership distributions																		(11,733)			(11,733)
Net income (loss)																		31,665			31,665					31,291	31,291	374	31,665
Ending balance at Dec. 31, 2019																				$ (27,465)	1,444,451	$ 407,435	$ 582	$ 1,330,444	$ (24,642)	$ (376,002)	$ 1,337,817	$ 106,634	$ 1,444,451
Ending balance, shares at Dec. 31, 2019																						7,443,000	58,228,000
Limited Partners' Capital, Ending balance at Dec. 31, 2019																	$ 407,435	$ 1,064,481
Limited Partners' Capital Ending balance, shares at Dec. 31, 2019																	7,443,000	64,901,000
Ending balance, shares at Dec. 31, 2019																			1,000
Partners' Capital, Ending Balance at Dec. 31, 2019																					$ 1,444,451