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Debt - Senior Unsecured Notes (Details) - Senior Notes - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Series D, Series E, and Series F Senior Unsecured Notes [Member]
Line of Credit Facility [Line Items]
Face amount		$ 450,000,000.0
Series D Senior Notes due 2028
Line of Credit Facility [Line Items]
Face amount		$ 115,000,000.0
Stated interest rate	4.08%	4.08%
Series E Senior Notes due 2030
Line of Credit Facility [Line Items]
Face amount		$ 160,000,000.0
Stated interest rate	4.26%	4.26%
Series F Senior Notes due 2033
Line of Credit Facility [Line Items]
Face amount		$ 175,000,000.0
Stated interest rate	4.44%	4.44%

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
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- Definition

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

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