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Share-Based Compensation (Summary Of The Changes In The Number Of Outstanding Phantom Stock Shares) (Details) [Axis] | 12 Months Ended
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Dec. 31, 2017 shares
Employee Phantom Stock Plan [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Balance of shares outstanding at December 31, 2014 | 517,693
Granted | 0
Settled | (21,506)
Forfeited | (4,722)
Balance of shares outstanding at December 31, 2015 | 491,465
Director Phantom Stock Plan [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Balance of shares outstanding at December 31, 2014 | 68,162
Granted | 0
Settled | 0
Forfeited | 0
Balance of shares outstanding at December 31, 2015 | 68,162
Phantom Shares [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Balance of shares outstanding at December 31, 2014 | 585,855
Granted | 0
Settled | (21,506)
Forfeited | (4,722)
Balance of shares outstanding at December 31, 2015 | 559,627

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- Definition The number of shares settled 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 No definition available. + Details
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Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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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://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 + Details
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Period Type: | duration

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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=96867065&loc=d3e5070-113901 + Details
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Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Period Type: | duration

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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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Balance Type: | na
Period Type: | instant

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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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