Debt (Outstanding Debt Including Capital Leases) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Weighted average coupon interest rate	3.54%
Total debt and lease obligations	$ 1,463,904	$ 1,356,674
Less net debt issuance costs	(10,839)	(11,557)
Total outstanding debt, net	$ 1,453,065	1,345,117
Unsecured Revolving Credit Facility \| Unsecured Revolving Credit Facility
Debt Instrument [Line Items]
Weighted average coupon interest rate	2.71%
Maturity date	Dec. 17, 2023
Outstanding debt	$ 317,028	252,000
Term Loan I \| Term Loan I
Debt Instrument [Line Items]
Weighted average coupon interest rate	3.16%
Maturity date	Dec. 17, 2024
Outstanding debt	$ 225,000	350,000
Term Loan II \| Term Loan II
Debt Instrument [Line Items]
Weighted average coupon interest rate	3.19%
Maturity date	Apr. 27, 2025
Outstanding debt	$ 225,000	350,000
Term Loan III \| Term Loan III
Debt Instrument [Line Items]
Weighted average coupon interest rate	3.19%
Maturity date	Oct. 18, 2026
Outstanding debt	$ 250,000
Operating Partnership And QTS Finance Corporation
Debt Instrument [Line Items]
Weighted average coupon interest rate	4.75%
Maturity date	Nov. 15, 2025
Outstanding debt	$ 400,000	400,000
Lenexa Mortgage \| Lenexa Mortgage
Debt Instrument [Line Items]
Weighted average coupon interest rate	4.10%
Maturity date	May 01, 2022
Outstanding debt	$ 1,736	1,801
Finance Leases \| Finance Leases
Debt Instrument [Line Items]
Weighted average coupon interest rate	4.35%
Maturity date description	2021 - 2038
Outstanding debt	$ 45,140	$ 2,873

Amount of short-term and long-term debt and lease obligation.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.

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Amount, after accumulated amortization, of debt discount (premium).

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Weighted average interest rate of debt outstanding.

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