Debt (Outstanding Debt Including Capital Leases) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Weighted average coupon interest rate	3.48%
Total debt and lease obligations	$ 1,241,565	$ 977,708
Less discount and debt issuance costs	(11,636)	(11,882)
Total outstanding debt, net	$ 1,229,929	965,826
Revolving Credit Facility
Debt Instrument [Line Items]
Weighted average coupon interest rate	2.85%
Maturity date	Dec. 17, 2021
Outstanding debt	$ 131,000	139,000
Term Loan I [Member]
Debt Instrument [Line Items]
Weighted average coupon interest rate	2.88%
Maturity date	Dec. 17, 2022
Outstanding debt	$ 350,000	300,000
Term Loan II [Member]
Debt Instrument [Line Items]
Weighted average coupon interest rate	2.91%
Maturity date	Apr. 27, 2023
Outstanding debt	$ 350,000	200,000
Operating Partnership Quality Tech LP And QTS Finance Corporation [Member]
Debt Instrument [Line Items]
Weighted average coupon interest rate	4.75%
Maturity date	Nov. 15, 2025
Outstanding debt	$ 400,000
Operating Partnership And QTS Finance Corporation
Debt Instrument [Line Items]
Maturity date	Aug. 01, 2022
Outstanding debt		300,000
Lenexa Mortgage
Debt Instrument [Line Items]
Weighted average coupon interest rate	4.10%
Maturity date	May 01, 2022
Outstanding debt	$ 1,866
Capital Lease and Lease Financing Obligations [Member]
Debt Instrument [Line Items]
Weighted average coupon interest rate	2.01%
Maturity date description	2018 - 2019
Capital Lease and Lease Financing Obligations	$ 8,699	$ 38,708

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

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

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- Definition

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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- Definition

Weighted average interest rate of debt outstanding.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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