CONSOLIDATED FINANCIAL STATEMENTS CONSOLIDATED STATEMENT OF EQUITY - USD ($) $ in Thousands	Qualitytech, LP Accumulated Other Comprehensive Income (Loss)	Qualitytech, LP General Partner	Qualitytech, LP Limited Partner	Qualitytech, LP	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Dividends in Excess of Earnings	Total stockholders' Equity	Noncontrolling Interest	Total
Beginning balance at Dec. 31, 2014					$ 294	$ 324,917		$ (22,503)	$ 302,708	$ 77,477	$ 380,185
Beginning balance at Dec. 31, 2014			$ 380,185
Partners' Capital, Beginning Balance at Dec. 31, 2014				$ 380,185
Beginning balance, shares at Dec. 31, 2014					29,408
Beginning balance, shares at Dec. 31, 2014		1,000	36,935,000
Issuance of shares through equity award plan			$ (644)	(644)	$ 3	(3)				(644)	(644)
Issuance of shares through equity award plan, shares			338,000		338
Reclassification of noncontrolling interest upon conversion of partnership units to common stock					$ 7	9,239			9,246	(9,246)
Reclassification of noncontrolling interest upon conversion of partnership units to common stock, shares					730
Equity-based compensation expense			$ 6,964	6,964		5,866			5,866	1,098	6,964
Net proceeds from equity offering			$ 368,664	368,664	$ 108	330,256			330,364	38,300	368,664
Shares issued			10,750,000		10,750
Dividend to shareholders			$ (50,555)	(50,555)				(50,555)	(50,555)		(50,555)
Distributions to noncontrolling interests										(8,877)	(8,877)
Partnership distributions			(8,877)	(8,877)
Net income			24,129	24,129				20,326	20,326	3,803	24,129
Ending balance at Dec. 31, 2015					$ 412	670,275		(52,732)	617,955	101,911	719,866
Ending balance at Dec. 31, 2015			$ 719,866
Partners' Capital, Ending Balance at Dec. 31, 2015				719,866
Ending balance, shares at Dec. 31, 2015					41,226
Ending balance, shares at Dec. 31, 2015		1,000	48,023,000
Net share activity through equity award plan					$ 3	(3)				(1,726)	(1,726)
Net share activity through equity award plan, shares					280
Issuance of shares through equity award plan			$ (1,726)	(1,726)
Issuance of shares through equity award plan, shares			280,000
Equity-based compensation expense			$ 10,584	10,584		9,229			9,229	1,355	10,584
Net proceeds from equity offering			$ 275,862	275,862	$ 63	252,282			252,345	23,517	275,862
Shares issued			6,325,000		6,325
Dividend to shareholders			$ (66,586)	(66,586)				(66,586)	(66,586)		(66,586)
Distributions to noncontrolling interests										(9,875)	(9,875)
Partnership distributions			(9,875)	(9,875)
Net income			24,685	24,685				21,525	21,525	3,160	24,685
Ending balance at Dec. 31, 2016					$ 478	931,783		(97,793)	834,468	118,342	952,810
Ending balance at Dec. 31, 2016			952,810
Partners' Capital, Ending Balance at Dec. 31, 2016			$ 952,810	952,810
Ending balance, shares at Dec. 31, 2016					47,831
Ending balance, shares at Dec. 31, 2016		1,000	54,628,000
Net share activity through equity award plan					$ 6	893			899	123	1,022
Increase in fair value of interest rate swaps	$ 1,449			1,449			$ 1,283		1,283	166	1,449
Issuance of shares through equity award plan			$ 1,022	1,022
Issuance of shares through equity award plan, shares			582,000		582
Reclassification of noncontrolling interest upon conversion of partnership units to common stock					$ 3	8,352			8,355	(8,355)
Reclassification of noncontrolling interest upon conversion of partnership units to common stock, shares					253
Equity-based compensation expense			$ 13,863	13,863		12,196			12,196	1,667	13,863
Net proceeds from equity offering			$ 107,495	107,495	$ 20	95,952			95,972	11,523	107,495
Shares issued			2,036,000		2,036
Dividend to shareholders			$ (77,041)	(77,041)				(77,041)	(77,041)		(77,041)
Distributions to noncontrolling interests										(10,399)	(10,399)
Partnership distributions			(10,399)	(10,399)
Net income			1,457	1,457				1,282	1,282	175	1,457
Ending balance at Dec. 31, 2017					$ 507	$ 1,049,176	$ 1,283	$ (173,552)	$ 877,414	$ 113,242	$ 990,656
Ending balance at Dec. 31, 2017			989,207
Partners' Capital, Ending Balance at Dec. 31, 2017	$ 1,449		$ 989,207	$ 990,656
Ending balance, shares at Dec. 31, 2017					50,702
Ending balance, shares at Dec. 31, 2017		1,000	57,246,000