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Performance Incentive Plan (Other Grants) (Details) | 12 Months Ended
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Dec. 31, 2018 $ / shares shares
Other share grants under the 2017 Plan: |
Restricted shares granted (in shares) | 40,581
Restricted shares granted, weighted average share price (in dollars per share) | $ / shares | $ 41.84
Shares available under the 2017 Plan for grant, end of period (in shares) | 1,471,231
Directors’ fees |
Other share grants under the 2017 Plan: |
Restricted shares granted (in shares) | 15,712
Restricted shares granted, weighted average share price (in dollars per share) | $ / shares | $ 41.75
Deferred directors’ fees |
Other share grants under the 2017 Plan: |
Restricted shares granted (in shares) | 24,869
Restricted shares granted, weighted average share price (in dollars per share) | $ / shares | $ 41.89

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Exercise Price + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period [Abstract] + References No definition available. + Details
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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). + 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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