Unsecured Notes Payable (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Principal balance	$ 696,055	$ 695,748
Senior Notes
Debt Instrument [Line Items]
Principal balance	700,000	700,000
Discount, net of accumulated amortization	(793)	(853)
Capitalized loan fees, net of accumulated amortization	$ (3,152)	$ (3,399)
Weighted average interest rate (as a percent)	4.19%	4.19%
Senior Notes \| 4.12% Notes Due 2021
Debt Instrument [Line Items]
Principal balance	$ 100,000	$ 100,000
Stated interest rate (as a percent)	4.12%	4.12%
Senior Notes \| 4.58% Notes Due 2024
Debt Instrument [Line Items]
Principal balance	$ 150,000	$ 150,000
Stated interest rate (as a percent)	4.58%	4.58%
Senior Notes \| 4.00% Notes Due 2025
Debt Instrument [Line Items]
Principal balance	$ 250,000	$ 250,000
Stated interest rate (as a percent)	4.00%	4.00%
Senior Notes \| 4.08% Notes Due 2026
Debt Instrument [Line Items]
Principal balance	$ 100,000	$ 100,000
Stated interest rate (as a percent)	4.08%	4.08%
Senior Notes \| 4.24% Notes Due 2028
Debt Instrument [Line Items]
Principal balance	$ 100,000	$ 100,000
Stated interest rate (as a percent)	4.24%	4.24%

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

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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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Amount, after accumulated amortization, of debt discount.

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Weighted average interest rate of debt outstanding.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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