Debt (Outstanding Debt Including Capital Leases) (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Weighted average effective interest rate (as a percent)	3.12%
Total debt and lease obligations	$ 1,653,426	$ 1,463,904
Less net debt issuance costs	(9,962)	(10,839)
Total outstanding debt, net	1,643,464	1,453,065
Lenexa Mortgage
Debt Instrument [Line Items]
Outstanding debt	1,700
Unsecured Credit Facility
Debt Instrument [Line Items]
Outstanding debt	$ 1,207,900
Unsecured Credit Facility, Revolving Credit Facility, Matures on December 17, 2023
Debt Instrument [Line Items]
Weighted average effective interest rate (as a percent)	1.41%
Maturity date	Dec. 17, 2023
Outstanding debt	$ 507,854	317,028
Unsecured Credit Facility, Term Loan
Debt Instrument [Line Items]
Outstanding debt	$ 700,000
Unsecured Credit Facility, Term Loan A, Matures on December 17, 2024
Debt Instrument [Line Items]
Weighted average effective interest rate (as a percent)	3.26%
Maturity date	Dec. 17, 2024
Outstanding debt	$ 225,000	225,000
Unsecured Credit Facility, Term Loan B, Matures on April 27 2025
Debt Instrument [Line Items]
Weighted average effective interest rate (as a percent)	3.30%
Maturity date	Apr. 27, 2025
Outstanding debt	$ 225,000	225,000
Unsecured Credit Facility, Term Loan C, Matures on October 18 2026
Debt Instrument [Line Items]
Weighted average effective interest rate (as a percent)	3.46%
Maturity date	Oct. 18, 2026
Outstanding debt	$ 250,000	250,000
Senior Notes
Debt Instrument [Line Items]
Weighted average effective interest rate (as a percent)	4.75%
Maturity date	Nov. 15, 2025
Outstanding debt	$ 400,000	400,000
Lenexa Mortgage
Debt Instrument [Line Items]
Weighted average effective interest rate (as a percent)	4.10%
Maturity date	May 01, 2022
Outstanding debt	$ 1,707	1,736
Finance Leases
Debt Instrument [Line Items]
Weighted average effective interest rate (as a percent)	4.35%
Maturity date description	2021 - 2038
Outstanding debt	$ 43,865	$ 45,140

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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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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