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Credit Arrangements (Details)	6 Months Ended		6 Months Ended	0 Months Ended		6 Months Ended		6 Months Ended								6 Months Ended		6 Months Ended
	Jun. 30, 2014 Senior Notes USD ($)	Dec. 28, 2012 Senior Notes USD ($)	Jun. 30, 2014 Senior Notes Minimum USD ($)	Jul. 25, 2013 Notes Agreement USD ($) payment	Dec. 28, 2012 Notes Agreement USD ($)	Jun. 30, 2014 Notes Agreement Minimum	Jun. 30, 2014 Credit Agreement USD ($)	Jun. 30, 2014 Credit Agreement LIBOR	Jun. 30, 2014 Credit Agreement Base rate	Jun. 30, 2014 Credit Agreement Federal funds rate	Jun. 30, 2014 Credit Agreement Prime rate	Jun. 30, 2014 Credit Agreement Minimum USD ($)	Jun. 30, 2014 Credit Agreement Revolving line of credit USD ($)	Jun. 30, 2014 Credit Agreement Commercial letters of credit USD ($)	Dec. 31, 2013 Credit Agreement Commercial letters of credit USD ($)	Jun. 30, 2014 Canadian Credit Facility Commercial letters of credit CAD	Dec. 31, 2013 Canadian Credit Facility Commercial letters of credit CAD	Jun. 30, 2014 Canadian Credit Facility Commercial letters of credit Maximum
Credit arrangements
Maximum borrowing capacity							$ 75,000,000						$ 75,000,000			8,000,000
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
Interest rate (as a percent)	3.65%			3.85%
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														4,659,000	5,074,000	3,011,000	2,788,000
Available borrowing capacity							70,341,000									4,989,000
Borrowings outstanding													0
Term of credit facility																		5 years
Annual fee (as a percent)																1.00%
Required principal payment	7,100,000			3,600,000
Initial principal amount		$ 50,000,000		$ 25,000,000	$ 25,000,000
Number of annual principal payments				7

X

- 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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X

- Definition

Represents the number of annual principal payments of debt instrument required by the entity.

+ References

No definition available.

+ Details

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X

- Definition

Represents the amount of prepayment to be paid on the debt instrument.

+ References

No definition available.

+ Details

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Balance Type:	credit
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X

- 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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X

- Definition

Represents the incremental maximum borrowing capacity under the credit facility.

+ References

No definition available.

+ Details

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ 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



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-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

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



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 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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 SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

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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

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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 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



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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

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-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



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