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Debt and Borrowing Arrangements (Details) (USD $) In Millions, unless otherwise specified			12 Months Ended		12 Months Ended													0 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Revolving credit facility	Dec. 31, 2012 Revolving credit facility	Dec. 31, 2013 Revolving credit facility Minimum	Dec. 31, 2013 Revolving credit facility Maximum	Dec. 31, 2013 Revolving credit facility ABR	Dec. 31, 2013 Revolving credit facility Prime Rate	Dec. 31, 2013 Revolving credit facility Federal Funds Effective Rate	Dec. 31, 2013 Revolving credit facility LIBOR rate	Dec. 31, 2013 Revolving credit facility LIBOR rate Minimum	Dec. 31, 2013 Revolving credit facility LIBOR rate Maximum	Dec. 21, 2011 Swingline loans Maximum	Dec. 31, 2013 Letter of credit Minimum	Dec. 31, 2013 Letter of credit Maximum	Dec. 31, 2013 Standby letter of credit	Dec. 31, 2012 Standby letter of credit	Dec. 21, 2011 Credit Agreement	Dec. 31, 2013 Credit Agreement	Dec. 31, 2013 Credit Agreement Minimum	Dec. 31, 2013 Credit Agreement Maximum
Debt and Borrowing Arrangements
Term of the credit agreement																		5 years
Maximum borrowing capacity													$ 25.0					$ 175.0
Option to increase borrowing capacity																		75.0
Variable rate basis							ABR	Prime Rate	Federal Funds Effective Rate	LIBOR
Interest rate margin (as a percent)					0.00%	1.00%			0.50%	1.00%	1.00%	2.00%
Letter of credit fee (as a percent)														1.00%	2.00%
Facing fees (as a percent)			0.125%
Commitment fee on unused portion of facility (as a percent)			0.20%
Leveraged debt ratio																					3.0
Interest coverage ratio																				3.0
Outstanding amount of credit agreement			0	0
Letters of credit outstanding	18.4	19.7														18.4	19.7
Interest rate (as a percent)																1.125%
Remaining borrowing capacity																			$ 156.6

X

- Definition

Represent the minimum interest coverage ratio under the credit agreement.

+ References

No definition available.

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X

- Definition

Represents the maximum leveraged debt ratio under the credit agreement.

+ References

No definition available.

+ Details

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X

- Definition

Represents the fees for the letter of credit facility, expressed as a percentage.

+ References

No definition available.

+ Details

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X

- Definition

The percentage of fronting fees paid on the outstanding amount of letters of credit.

+ References

No definition available.

+ Details

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X

- Definition

Represents the option to increase maximum borrowings on the credit facility.

+ References

No definition available.

+ Details

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X

- 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.

+ Details

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- Details

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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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X

- Definition

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

+ References

No definition available.

+ Details

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- Definition

The effective interest rate at the end of the reporting period.

+ 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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-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



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

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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

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- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

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- Definition

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19

-Subparagraph a

-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 210.5-02.19(a))

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



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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 210

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-Paragraph 1

-Subparagraph (SX 210.9-03.13)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.(a),16(a)(1))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910



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-Article 7



Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

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-Number 210

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-Subparagraph 2, 3

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