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Stock Incentive Plan Stock Incentive Plan (Performance Awards Earned and Issued) (Details) - Performance Shares | 12 Months Ended
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Dec. 31, 2017 shares
Schedule of Share-based compensation arrangements by share-based payment award, performance shares earned and issued [Line Items] |
Shares earned (in shares) | 0
Shares issued subsequent to year-end (in shares) | 0

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- Definition [Line Items] for Schedule of Share-based compensation arrangements by share-based payment award, performance shares earned and issued [Table] + References No definition available. + Details
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Period Type: | duration

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- Definition Share-based compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Issued + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Details
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