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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
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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 |  |

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- Definition Represent the minimum interest coverage ratio under the credit agreement. + References No definition available. + Details
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- Definition Represents the maximum leveraged debt ratio under the credit agreement. + References No definition available. + Details
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- Definition Represents the fees for the letter of credit facility, expressed as a percentage. + References No definition available. + Details
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- Definition The percentage of fronting fees paid on the outstanding amount of letters of credit. + References No definition available. + Details
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- Definition Represents the option to increase maximum borrowings on 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. + Details
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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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- 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. + Details
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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. + 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 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 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 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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- 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. + Details
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