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Employee Benefit Plans Fair Value Measurements (Details) (Pension Plans, Defined Benefit [Member], USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | $ 320,699 | $ 295,655 | $ 302,464
Fair Value, Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | 128,393 | 211,025 |
Fair Value, Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | 192,306 | 84,630 |
Equity Securities, Domestic [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | 126,904 | 128,834 |
Equity Securities, Domestic [Member] | Fair Value, Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | 50,653 | 128,834 |
Equity Securities, Domestic [Member] | Fair Value, Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | 76,251 | 0 |
Equity Securities, International [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | 78,931 | 57,728 |
Equity Securities, International [Member] | Fair Value, Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | 51,758 | 57,728 |
Equity Securities, International [Member] | Fair Value, Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | 27,173 | 0 |
Domestic Debt Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | 81,045 | 80,243 |
Domestic Debt Securities [Member] | Fair Value, Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | 0 | 0 |
Domestic Debt Securities [Member] | Fair Value, Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | 81,045 | 80,243 |
Foreign Debt Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | 15,745 | 14,381 |
Foreign Debt Securities [Member] | Fair Value, Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | 15,745 | 14,381 |
Foreign Debt Securities [Member] | Fair Value, Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | 0 | 0 |
Real Estate Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | 10,208 | 9,846 |
Real Estate Funds [Member] | Fair Value, Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | 10,208 | 9,846 |
Real Estate Funds [Member] | Fair Value, Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | 0 | 0 |
Short-term Investments [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | 7,866 | 4,623 |
Short-term Investments [Member] | Fair Value, Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | 29 | 236 |
Short-term Investments [Member] | Fair Value, Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | $ 7,837 | $ 4,387 |

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=6867990&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 49 -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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d(iv)(b)(i) -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. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b -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. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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