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Employee Benefits Plans (Details 9) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items] |  |  |
Contributions | $ 6,746 | $ 5,988 | $ 5,199
Western Conference Teamsters [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension Plan Number | 91-6145047 |  |
Pension Protection Act Zone Status | Green | Green |
FIP/RP Status Pending/ Implemented | No |  |
Contributions | 1,943 | 1,855 | 1,494
Surcharge Imposed | No |  |
Expiration Date of Collective Bargaining Agreement | 6/30/14 to 3/31/16 |  |
IAM National [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension Plan Number | 51-6031295 |  |
Pension Protection Act Zone Status | Green | Green |
FIP/RP Status Pending/ Implemented | No |  |
Contributions | 2,038 | 1,794 | 1,573
Surcharge Imposed | No |  |
Expiration Date of Collective Bargaining Agreement | 4/30/13 to 3/31/17 |  |
Automobile Mechanics Local No. 701 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension Plan Number | 36-6042061 |  |
Pension Protection Act Zone Status | Red | Red |
FIP/RP Status Pending/ Implemented | FIP Adopted |  |
Contributions | 1,527 | 1,203 | 1,076
Surcharge Imposed | Yes |  |
Expiration Date of Collective Bargaining Agreement | 5/31/13 to 10/31/14 |  |
International Association of Machinists Motor City [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension Plan Number | 38-6237143 |  |
Pension Protection Act Zone Status | Red (2) | Red (2) |
FIP/RP Status Pending/ Implemented | RP adopted |  |
Contributions | 437 | 392 | 372
Surcharge Imposed | No |  |
Expiration Date of Collective Bargaining Agreement | 1/31/14 to 3/31/16 |  |
Central States Southwest and Southwest Areas [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension Plan Number | 36-6044243 |  |
Pension Protection Act Zone Status | Red | Red |
FIP/RP Status Pending/ Implemented | RP adopted |  |
Contributions | 226 | 182 | 158
Surcharge Imposed | No |  |
Expiration Date of Collective Bargaining Agreement | 6/1/12 to 5/31/17 |  |
Other Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Contributions | $ 575 | $ 562 | $ 526

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- Definition Expiration Date of Collective Bargaining Agreement. + References No definition available. + Details
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- Definition FIP/RP Status Pending/ Implemented. + References No definition available. + Details
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- Definition EIN/Pension Plan Number. + References No definition available. + Details
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- Definition Pension Protection Act Zone Status. + References No definition available. + Details
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- Details
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- Definition Amount of contributions made to multiemployer plans by the employer. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450702-114947 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450691-114947 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450657-114947 + Details
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