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Employee Benefit Plans (Summary Of Current Allocation Percentages Of Plan Assets) (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012
Horizon Defined Benefit Plan [Member] [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation | 100.00% |
Percentage of Plan Assets | 100.00% | 100.00%
Horizon Defined Benefit Plan [Member] [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation | 58.00% |
Allowable-Allocation Range, Minimum | 40.00% |
Allowable-Allocation Range, Maximum | 100.00% |
Percentage of Plan Assets | 53.00% | 39.00%
Horizon Defined Benefit Plan [Member] [Member] | Debt Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation | 30.00% |
Allowable-Allocation Range, Minimum | 20.00% |
Allowable-Allocation Range, Maximum | 40.00% |
Percentage of Plan Assets | 28.00% | 36.00%
Horizon Defined Benefit Plan [Member] [Member] | Cash and Cash Equivalents [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation | 2.00% |
Allowable-Allocation Range, Minimum | 3.00% |
Allowable-Allocation Range, Maximum | 10.00% |
Percentage of Plan Assets | 7.00% | 25.00%
Horizon Defined Benefit Plan [Member] [Member] | Other Securites [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation | 10.00% |
Allowable-Allocation Range, Minimum | 0.00% |
Allowable-Allocation Range, Maximum | 15.00% |
Percentage of Plan Assets | 12.00% | 0.00%
Community Defined Benefit Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation | 100.00% |
Percentage of Plan Assets | 100.00% |
Community Defined Benefit Plan [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation | 25.00% |
Allowable-Allocation Range, Minimum | 20.00% |
Allowable-Allocation Range, Maximum | 30.00% |
Percentage of Plan Assets | 26.00% |
Community Defined Benefit Plan [Member] | Debt Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation | 75.00% |
Allowable-Allocation Range, Minimum | 70.00% |
Allowable-Allocation Range, Maximum | 80.00% |
Percentage of Plan Assets | 74.00% |

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- Definition Target allocation of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920 + Details
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- Definition Target allocation maximum percentage of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920 + Details
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- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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