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Debt (Details) (USD $) | 12 Months Ended |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 LIBOR [Member] | Dec. 31, 2013 Base Rate [Member] | Dec. 31, 2013 Term loan [Member] | Jul. 31, 2011 Term loan [Member] | Dec. 31, 2013 Term loan [Member] July 2012 to June 2014 [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date |  |  | Jun. 30, 2016 |  |  |  |  |
Financing costs |  |  | $ 1,700,000 |  |  |  |  |
Amortization period of debt issuance costs |  |  | 5Y |  |  |  |  |
Borrowings outstanding | 59,400,000 | 92,200,000 |  |  |  |  |  |
Term loan payments 2014 | 25,000,000 |  |  |  |  |  |  |
Term loan payments 2015 | 34,400,000 |  |  |  |  |  |  |
Revolving loans maximum borrowing capacity | 125,000,000 |  |  |  |  |  |  |
Revolving loans potential increment in maximum borrowing capacity | 175,000,000 |  |  |  |  |  |  |
Revolving loans amount outstanding | 30,300,000 | 48,000,000 |  |  |  |  |  |
Letters of credit outstanding | 573,000 | 1,300,000 |  |  |  |  |  |
Debt outstanding | 89,700,000 | 140,200,000 |  |  |  |  |  |
Base margin (in hundredths) |  |  |  | 2.00% | 0.25% |  |  |
Duration of interest rate cash flow hedge | 3 years |  |  |  |  |  |  |
Amount of interest rate hedge |  |  |  |  |  | 51,000,000 | 101,000,000 |
Effective interest rate on the hedged term debt |  |  |  |  |  |  |  | 1.615% plus our base margin
Interest rate range, minimum (in hundredths) | 2.16% |  |  |  |  |  |  |
Interest rate range, maximum (in hundredths) | 3.62% |  |  |  |  |  |  |
Effective interest rate (in hundredths) | 3.07% |  |  |  |  |  |  |
Interest expense, net | $ 3,700,000 | $ 5,200,000 |  |  |  |  |  |

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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond 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 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: 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 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + 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)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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