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14. Employee Benefits - Asset Allocation (Details) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
Weighted Average Asset Allocation at Year-End | 100.00% | 100.00%
Cash And Cash Equivalents [Member] |  |
Weighted Average Asset Allocation at Year-End | 0.00% | 1.00%
Equity Securities [Member] |  |
Weighted Average Asset Allocation at Year-End | 87.00% | 83.00%
Debt Securities [Member] |  |
Weighted Average Asset Allocation at Year-End | 13.00% | 16.00%

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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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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration