Debt - Schedule of Debt (Details)	12 Months Ended
Dec. 31, 2021 USD ($) extension	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Subtotal/weighted average	2.93%	3.03%
Amount outstanding	$ 1,877,790,000	$ 1,622,004,000
Secured Debt
Debt Instrument [Line Items]
Amount outstanding	0	27,936,000
Premium (discount) and unamortized debt issuance costs	0	326,000
Secured Debt \| $35 Million Fixed-Rate Loan
Debt Instrument [Line Items]
Face amount of facility	$ 35,000,000
Stated rate (percentage)	5.55%
Effective rate	0.00%
Amount outstanding	$ 0	27,610,000
Unsecured Debt
Debt Instrument [Line Items]
Subtotal/weighted average	2.93%
Amount outstanding	$ 1,877,790,000	1,594,068,000
Premium (discount) and unamortized debt issuance costs	(12,210,000)	(10,932,000)
Unsecured Debt \| Amended and Restated $300 Million Unsecured 2011 Term Loan
Debt Instrument [Line Items]
Face amount of facility	$ 300,000,000
Effective rate	0.00%
Amount outstanding	$ 0	300,000,000
Unsecured Debt \| Amended and Restated $300 Million Unsecured 2011 Term Loan \| LIBOR
Debt Instrument [Line Items]
Spread on variable rate	1.00%
Unsecured Debt \| $500 Million Unsecured 2018 Line of Credit
Debt Instrument [Line Items]
Face amount of facility	$ 500,000,000
Additional extension period	1 year
Number of extension periods \| extension	2
Maturity extension period	6 months
Unsecured Debt \| $500 Million Unsecured 2018 Line of Credit \| Line of Credit
Debt Instrument [Line Items]
Face amount of facility	$ 500,000,000
Effective rate	1.01%
Amount outstanding	$ 290,000,000	5,000,000
Unsecured Debt \| $500 Million Unsecured 2018 Line of Credit \| Line of Credit \| LIBOR
Debt Instrument [Line Items]
Spread on variable rate	0.90%
Unsecured Debt \| $350 Million Unsecured Senior Notes due 2023
Debt Instrument [Line Items]
Face amount of facility	$ 350,000,000
Stated rate (percentage)	3.40%
Effective rate	3.43%
Amount outstanding	$ 350,000,000	350,000,000
Unsecured Debt \| $400 Million Unsecured Senior Notes due 2024
Debt Instrument [Line Items]
Face amount of facility	$ 400,000,000
Stated rate (percentage)	4.45%
Effective rate	4.10%
Amount outstanding	$ 400,000,000	400,000,000
Unsecured Debt \| $250 Million Unsecured 2018 Term Loan
Debt Instrument [Line Items]
Face amount of facility	$ 250,000,000
Effective rate	2.05%
Amount outstanding	$ 250,000,000	250,000,000
Derivative, notional amount	$ 100,000,000
Derivative fixed interest rate	3.56%
Unsecured Debt \| $250 Million Unsecured 2018 Term Loan \| LIBOR
Debt Instrument [Line Items]
Spread on variable rate	0.95%
Unsecured Debt \| $300 Million Unsecured Senior Notes due 2030
Debt Instrument [Line Items]
Face amount of facility		300,000,000
Stated rate (percentage)	3.15%
Effective rate	3.90%
Amount outstanding	$ 300,000,000	300,000,000
Unsecured Debt \| $300 Million 2021 Senior Notes
Debt Instrument [Line Items]
Face amount of facility	$ 300,000,000
Stated rate (percentage)	2.75%
Effective rate	2.78%
Amount outstanding	$ 300,000,000	$ 0

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Debt Instrument, Maximum Maturity Extension Period

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Debt Instrument, Number of Maturity Extension Periods

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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- Definition

Face (par) amount of debt instrument at time of issuance.

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

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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No definition available.

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- Definition

Amount of unamortized debt discount (premium) and debt issuance costs.

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- Definition

Weighted average interest rate of debt outstanding.

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Fixed interest rate related to the interest rate derivative.

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Nominal or face amount used to calculate payment on derivative.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of all notes and loans payable (with maturities initially due after one year or beyond the operating cycle if longer).

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