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Employee Benefit Plans - Summary of plan weighted average asset allocation by asset category along with target allocation for 2012 (Details) | 12 Months Ended |
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Dec. 31, 2012 | Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of Plan Assets | 100.00% | 100.00%
Target Allocation for 2013 total percentage | 100.00% |
Cash and Cash Equivalents | Retirement Income Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of Plan Assets | 0.20% | 0.70%
Target Allocation for 2013 minimum percentage | 0.00% |
Target Allocation for 2013 maximum percentage | 5.00% |
Debt Securities - Core Fixed Income | Retirement Income Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of Plan Assets | 20.20% | 23.20%
Target Allocation for 2013 minimum percentage | 15.00% |
Target Allocation for 2013 maximum percentage | 50.00% |
Tactical - Fund of Equity and Debt Securities | Retirement Income Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of Plan Assets | 15.10% | 16.30%
Target Allocation for 2013 minimum percentage | 10.00% |
Target Allocation for 2013 maximum percentage | 20.00% |
Domestic Equity Securities | Retirement Income Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of Plan Assets | 15.20% | 15.20%
Target Allocation for 2013 minimum percentage | 30.00% |
Target Allocation for 2013 maximum percentage | 50.00% |
Global Equity Securities | Retirement Income Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of Plan Assets | 16.00% | 14.80%
Target Allocation for 2013 minimum percentage | 10.00% |
Target Allocation for 2013 maximum percentage | 20.00% |
International Equity Securities | Retirement Income Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of Plan Assets | 15.10% | 14.60%
Target Allocation for 2013 minimum percentage | 10.00% |
Target Allocation for 2013 maximum percentage | 20.00% |
Real Estate | Retirement Income Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of Plan Assets | 9.20% | 5.60%
Target Allocation for 2013 minimum percentage | 0.00% |
Target Allocation for 2013 maximum percentage | 10.00% |
Real Return | Retirement Income Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of Plan Assets | 9.00% | 9.60%
Target Allocation for 2013 minimum percentage | 0.00% |
Target Allocation for 2013 maximum percentage | 10.00% |
Other | Retirement Income Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of Plan Assets | 0.00% | 0.00%
Target Allocation for 2013 minimum percentage | 0.00% |
Target Allocation for 2013 maximum percentage | 5.00% |

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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=21915506&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=21915506&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=21915506&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=21915506&loc=d3e2446-114920 + Details
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- Definition Target allocation minimum 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=21915506&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=21915506&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=21915506&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=21915506&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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