CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net income (loss)	$ (7,175)	$ 1,457	$ 24,685
Other comprehensive income (loss):
Increase in fair value of interest rate swaps	895	1,449
Reclassification of other comprehensive income to interest expense	110	0	0
Comprehensive income (loss)	(6,170)	2,906	24,685
Comprehensive (income) loss attributable to noncontrolling interests	711	(349)	(3,160)
Comprehensive income (loss) attributable to QTS Realty Trust, Inc.	(5,459)	2,557	21,525
Qualitytech, LP
Net income (loss)	(7,175)	1,457	24,685
Other comprehensive income (loss):
Increase in fair value of interest rate swaps	895	1,449
Reclassification of other comprehensive income to interest expense	110
Comprehensive income (loss)	$ (6,170)	$ 2,906	$ 24,685