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Debt - Schedule of Debt Instrument Redemption (Details) - Senior Notes [Member] - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Face amount of debt instrument	$ 500,000,000	$ 500,000,000
Unamortized discount	(1,439,000)	(1,507,000)
Unamortized debt issuance costs	(3,154,000)	(3,295,000)
Long-term debt	495,407,000	495,198,000
Senior Notes Due 2024 [Member]
Debt Instrument [Line Items]
Face amount of debt instrument	$ 250,000,000	250,000,000
Stated interest rate	4.40%
Percentage of issuance price	99.883%
Senior Notes Due 2023 [Member]
Debt Instrument [Line Items]
Face amount of debt instrument	$ 250,000,000	$ 250,000,000
Stated interest rate	4.25%
Percentage of issuance price	99.026%

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Debt Instrument, Percentage of Issuance Price

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after accumulated amortization, of debt discount.

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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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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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