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Credit Arrangements (Details) | 0 Months Ended | 6 Months Ended | 0 Months Ended | 6 Months Ended |  | 12 Months Ended | 6 Months Ended |  | 6 Months Ended |  |  |  | 6 Months Ended |  | 6 Months Ended |
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Dec. 28, 2012 Senior Notes USD ($) | Jun. 30, 2013 Senior Notes USD ($) | Jun. 30, 2013 Senior Notes Minimum USD ($) | Jun. 30, 2013 Notes Agreement | Jun. 30, 2013 Notes Agreement Minimum | Dec. 28, 2012 Notes Agreement Maximum USD ($) | Jun. 30, 2013 Notes Agreement Maximum | Dec. 18, 2009 Subordinated Promissory Note JCG USD ($) | Dec. 31, 2012 Note A Rockford USD ($) | Jun. 30, 2013 Credit Agreement LIBOR | Jun. 30, 2013 Credit Agreement Base rate | Jun. 30, 2013 Credit Agreement Federal funds rate | Jun. 30, 2013 Credit Agreement Prime rate | Jun. 30, 2013 Credit Agreement Minimum | Jun. 30, 2013 Credit Agreement Revolving line of credit USD ($) | Jun. 30, 2013 Credit Agreement Revolving line of credit Minimum USD ($) | Jun. 30, 2013 Credit Agreement Commercial letters of credit USD ($) | Dec. 31, 2012 Credit Agreement Commercial letters of credit USD ($) | Dec. 31, 2010 Canadian Credit Facility Rockford USD ($) | Jun. 30, 2013 Canadian Credit Facility Commercial letters of credit CAD | Dec. 31, 2012 Canadian Credit Facility Commercial letters of credit CAD | Jun. 30, 2013 Canadian Credit Facility Commercial letters of credit Maximum | Oct. 29, 2009 Agreement with Private Bank and Trust Company USD ($)
Credit arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 75,000,000 |  |  |  |  | 10,000,000 |  |  |
Incremental maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |  |  |  |  |  |  |
Variable rate basis |  |  |  |  |  |  |  |  |  | LIBOR | Base Rate | Federal Funds Rate | prime rate |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 0.50% |  |  |  |  |  |  |  |  |  |  |
Prepayment to be paid on debt |  |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  |  |  |  |  |  |
Additional borrowings | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 3.65% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional borrowings to be incurred during the first three years of the debt agreement |  |  |  |  |  | 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of years in which additional notes can be issued |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity term of debt instrument |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restrictions on investments, change of control provisions and provisions as a percentage of total assets to be disposed off |  |  |  |  | 20.00% |  |  |  |  |  |  |  |  | 20.00% |  |  |  |  |  |  |  |  |
Total commercial letters of credit outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,659,000 | 4,808,000 |  | 3,539,000 | 1,364,000 |  |
Available borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 69,341,000 |  |  |  |  | 6,461,000 |  |  |
Borrowings outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  | 0
Term of credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |
Annual fee (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |
Required principal payment |  | 7,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial principal amount |  |  |  |  |  |  |  | 53,500,000 |  |  |  |  |  |  |  |  |  |  | 16,712,000 |  |  |  |
Amount outstanding |  |  |  |  |  |  |  |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment that the entity was required to make to cancel the notes |  |  |  |  |  |  |  |  | $ 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Represents the amount of additional borrowings to be incurred under the specified period of the debt agreement. + References No definition available. + Details
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- Definition Represents the number of years at the beginning of the debt agreement that additional notes can be issued. + References No definition available. + Details
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- Definition Represents the restrictions on investments, change of control provisions and provisions, expressed as a percentage of total assets to be disposed off as per the financial covenant. + References No definition available. + Details
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- Definition Represents the maturity term of the debt instrument. + References No definition available. + Details
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- Definition Represents the amount of prepayment to be paid on the debt instrument. + References No definition available. + Details
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- Definition The annual fee percentage based on any issued and outstanding letters of credit under the facility. + References No definition available. + Details
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- Definition Represents the incremental maximum borrowing capacity under the credit facility. + References No definition available. + Details
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- Definition The percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -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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- Definition Amount of the required periodic payments applied to principal. + 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 210.5-02.22) -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 22 -Article 5 + Details
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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 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 Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 10 -Section F Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Article 5 -Subsection 19, 20, 22 + Details
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