Debt - $400 Million 5% Senior Notes (Details) - Senior Notes [Member] - $400 Million 5% Senior Notes [Member] - USD ($)	12 Months Ended
Dec. 31, 2018	Apr. 15, 2015
Debt Instrument [Line Items]
Face amount	$ 400,000,000	$ 400,000,000
Stated interest rate (as a percent)	5.00%	5.00%
Debt instrument, maturity date	Apr. 15, 2023
Debt instrument, frequency of periodic payment	semi-annually
Redemption date	Apr. 15, 2018
Redemption Period One [Member]
Debt Instrument [Line Items]
Redemption price (as a percent)	103.75%
Redemption Period Two [Member]
Debt Instrument [Line Items]
Redemption price (as a percent)	102.50%
Redemption date	Apr. 15, 2019
Redemption Period Three [Member]
Debt Instrument [Line Items]
Redemption price (as a percent)	101.25%
Redemption date	Apr. 15, 2020
Redemption Period Four [Member]
Debt Instrument [Line Items]
Redemption price (as a percent)	100.00%
Redemption date	Apr. 15, 2021

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

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Description of the frequency of periodic payments (monthly, quarterly, annual).

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

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 10
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Start date of debt instrument redemption period, in CCYY-MM-DD format.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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