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Schedule II - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Schedule II - Valuation and Qualifying Accounts
QTS REALTY TRUST, INC.
SCHEDULE II – VALUATION AND QUALIFYING ACCOUNTS
December 31, 2020
Year Ended December 31,
(dollars in thousands)		Balance at
beginning of
period		Charge to
expenses		Additions/
(Deductions)		Balance at
end of
period
Allowance for uncollectible receivables
2020$2,279 $5,051 $(1,891)$5,439 
20193,764 2,859 (4,344)2,279 
201811,453 (2,275)(5,414)3,764 
Valuation allowance for deferred tax assets
2020$24,747 $1,877 $— $26,624 
20198,361 16,386 — 24,747 
2018713 7,648 — 8,361