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Equity Incentive Plans (Summary Of Restricted Share Unit Activity) (Details) $ / shares in Units, $ in Thousands | 9 Months Ended
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Sep. 30, 2016 USD ($) $ / shares shares
Range of settlement date for shares for non-employee trustee from grant date, minimum | 1 year
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward] |
Number of Shares, Outstanding at December 31, 2015 | shares | 390,441
Number of Shares, Granted | shares | 300,752
Number of Shares, Vested | shares | (156,876)
Number of Shares, Outstanding at September 30, 2016 | shares | 534,317
Weighted Average Grant Date Fair Value, Outstanding at December 31, 2015 | $ / shares | $ 54.84
Weighted Average Grant Date Fair Value, Granted | $ / shares | 61.53
Weighted Average Grant Date Fair Value, Vested | $ / shares | 52.74
Weighted Average Grant Date Fair Value, Outstanding at September 30, 2016 | $ / shares | $ 59.22
Weighted Average Life Remaining, Outstanding at September 30, 2016 (in years) | 1 year 3 months 6 days
Unamortized share-based compensation expense | $ | $ 18,600
Restricted Share Units [Member] |
Range of settlement date for shares for non-employee trustee from grant date, minimum | 1 year
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward] |
Number of Shares, Outstanding at December 31, 2015 | shares | 18,036
Number of Shares, Granted | shares | 15,805
Number of Shares, Vested | shares | (18,036)
Number of Shares, Outstanding at September 30, 2016 | shares | 15,805
Weighted Average Grant Date Fair Value, Outstanding at December 31, 2015 | $ / shares | $ 57.57
Weighted Average Grant Date Fair Value, Granted | $ / shares | 70.93
Weighted Average Grant Date Fair Value, Vested | $ / shares | 57.57
Weighted Average Grant Date Fair Value, Outstanding at September 30, 2016 | $ / shares | $ 70.93
Weighted Average Life Remaining, Outstanding at September 30, 2016 (in years) | 7 months 8 days
Unamortized share-based compensation expense | $ | $ 654

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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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://www.xbrl.org/2003/role/presentationRef -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=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued 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://www.xbrl.org/2003/role/presentationRef -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=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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=6415400&loc=d3e5070-113901 + Details
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