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Equity Incentive Plan Details 3 (Details) - $ / shares $ / shares in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |
Restricted Stock Units, Nonvested, Intrinsic Value | $ 27.8 | $ 34.9
Performance Stock Units, Grants in Period | 4,912 |
Performance Share Unit, Nonvested, Number of Shares | 12,814 | 8,050
Performance Share units, Nonvested, Intrinsic Value | $ 7.2 | $ 5.0
Share Based Compensation, Performance Shares Vested in the Period | 0 |
Share Based Compensation, Performance Shares Forfeited in the period | (148) |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |
Restricted Stock Units, Nonvested, Number, Beginning | 56,389 |
Restricted Stock Units, Grants in Period | 16,380 |
Restricted Stock Units, Vested in Period | (20,259) |
Restricted Stock Units, Forfeited in Period | (3,258) |
Restricted Stock Units, Nonvested, Number, Ending | 49,252 |

X
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan) that have a market condition. + References No definition available. + Details
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- Definition The number of performanmce based equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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