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Debt (Senior Credit Facility) (Details) (USD $) | 0 Months Ended | 3 Months Ended | 0 Months Ended | 3 Months Ended | 0 Months Ended | 3 Months Ended | 0 Months Ended | 3 Months Ended |
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Jul. 08, 2011 Senior Credit Facility [Member] | Mar. 30, 2013 Senior Credit Facility [Member] | Jan. 20, 2012 Incremental Senior Credit Facility [Member] | Mar. 30, 2013 Five-Year Senior, Secured, Revolving Credit Facility [Member] | Jan. 20, 2012 Amendment To The Senior Credit Facility [Member] | Mar. 30, 2013 Amendment To The Senior Credit Facility [Member] | Jan. 20, 2012 Eight Scheduled Quarterly [Member] Incremental Senior Credit Facility [Member] | Jan. 20, 2012 Four Scheduled Quarterly [Member] Incremental Senior Credit Facility [Member] | Mar. 30, 2013 Minimum [Member] Senior Credit Facility [Member] | Mar. 30, 2013 Maximum [Member] Senior Credit Facility [Member] | Mar. 30, 2013 Alternative A [Member] Minimum [Member] Libor [Member] Senior Credit Facility [Member] | Mar. 30, 2013 Alternative A [Member] Maximum [Member] Libor [Member] Senior Credit Facility [Member] | Mar. 30, 2013 Alternative B [Member] Federal Funds [Member] Senior Credit Facility [Member] | Mar. 30, 2013 Alternative B [Member] Monthly Libor [Member] Senior Credit Facility [Member] | Mar. 30, 2013 Alternative B [Member] Minimum [Member] Libor [Member] Senior Credit Facility [Member] | Mar. 30, 2013 Alternative B [Member] Maximum [Member] Libor [Member] Senior Credit Facility [Member] | Mar. 30, 2013 Standby Letters of Credit Guaranteeing Company Industrial Revenue Bonds [Member] Senior Credit Facility [Member] | Mar. 30, 2013 Standby Letters of Credit Related to Various Insurance Contracts and Foreign Vendor Commitments [Member] Senior Credit Facility [Member]
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, initiation date |  |  |  | Jul. 08, 2011 |  | Jan. 20, 2012 |  |  |  |  |  |  |  |  |  |  |  |
Term of line of credit (years) | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity under credit facility | $ 900,000,000 |  | $ 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of financing costs | 8,285,000 |  |  |  | 1,018,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized financing costs | 12,277,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly principal payments |  |  | 5,625,000 |  |  |  | 1,875,000 | 3,750,000 |  |  |  |  |  |  |  |  |  |
Basis spread on debt instrument |  |  |  |  |  |  |  |  |  |  | 1.25% | 2.00% | 0.50% | 1.00% | 0.25% | 1.00% |  |
Commitment fee percentage |  |  |  |  |  |  |  |  | 0.25% | 0.40% |  |  |  |  |  |  |  |
Consolidated interest coverage ratio |  |  |  |  |  |  |  |  | 3.0 |  |  |  |  |  |  |  |  |
Consolidated net leverage ratio |  |  |  |  |  |  |  |  |  | 3.75 |  |  |  |  |  |  |  |
Amount utilized from long-term lines of credit |  | 413,696,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available amount under credit facility |  | 486,304,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Utilized borrowings under credit facility |  | 316,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Standby letters of credit for various insurance contracts and commitments to foreign vendors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 46,823,000 | $ 50,273,000

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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Date the credit facility first became available, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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