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Debt and Credit Arrangements - Senior Secured Revolving Credit Facility (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Aug. 03, 2011
Debt Instrument |  |  |  |  |  |
Financing costs amortization | $ 400,000 | $ 400,000 | $ 700,000 | $ 700,000 |  |
Short-term debt outstanding | 66,800,000 |  | 66,800,000 |  | $ 58,900,000 |
Revolving Credit Facility |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Long term debt | 244,000,000 |  | 244,000,000 |  | $ 239,000,000 |
Senior Secured Revolving Credit Facility | Revolving Credit Facility |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Debt instrument, term |  |  |  |  | 5 years |
Maximum borrowing capacity | $ 450,000,000.0 |  | $ 450,000,000.0 |  |  |
Line of credit fronting fee (as a percentage) | 0.125% |  | 0.125% |  |  |
Debt instrument stated interest rate | 1.00% |  | 1.00% |  |  |
Maximum percentage of capital stock guaranteed by company | 65.00% |  | 65.00% |  |  |
Senior Secured Revolving Credit Facility | Revolving Credit Facility | Adjusted Base Rate |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Variable rate (as a percentage) |  |  | 1.00% |  |  |
Senior secured revolving credit facility due November 2022 | Swing line loan |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Debt instrument stated interest rate | 6.25% |  | 6.25% |  |  |
Short-term debt outstanding | $ 6,000,000 |  | $ 6,000,000 |  |  |
Interest expense | $ 5,100,000 |  | $ 5,100,000 |  |  |
Senior secured revolving credit facility due November 2022 | Revolving Credit Facility |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Line of credit fronting fee (as a percentage) | 0.125% |  | 0.125% |  |  |
Senior secured revolving credit facility due November 2022 | Revolving Credit Facility |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Debt instrument, term |  |  | 5 years |  |  |
Debt issuance costs | $ 2,500,000 |  | $ 2,500,000 |  |  |
Unamortized debt issuance costs | 2,200,000 |  | 2,200,000 |  |  |
Financing costs amortization | 200,000 | 200,000 | 300,000 | 300,000 |  |
Long term debt | $ 238,000,000 |  | $ 238,000,000 |  |  |
Debt instrument stated interest rate | 4.25% |  | 4.25% |  |  |
Interest expense | $ 2,600,000 |  | $ 2,600,000 |  |  |
Line of credit outstanding | 48,800,000 |  | 48,800,000 |  |  |
Line of credit remaining borrowing amount | 157,200,000 |  | $ 157,200,000 |  |  |
Senior secured revolving credit facility due November 2022 | Revolving Credit Facility | Minimum |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Line of credit commitment fee (as a percentage) |  |  | 0.20% |  |  |
Line of credit participation fee (as a percentage) |  |  | 1.50% |  |  |
Senior secured revolving credit facility due November 2022 | Revolving Credit Facility | Maximum |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Line of credit commitment fee (as a percentage) |  |  | 0.375% |  |  |
Line of credit participation fee (as a percentage) |  |  | 2.50% |  |  |
Senior secured revolving credit facility due November 2022 | Revolving Credit Facility Sub-limit - Swingline |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Maximum borrowing capacity | 25,000,000.0 |  | $ 25,000,000.0 |  |  |
Senior secured revolving credit facility due November 2022 | Revolving Credit Facility Sub-limit - Letters of Credit |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Maximum borrowing capacity | 100,000,000.0 |  | 100,000,000.0 |  |  |
Senior secured revolving credit facility due November 2022 | Revolving Credit Facility Sub-limit - Foreign Currency |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Maximum borrowing capacity | 100,000,000.0 |  | 100,000,000.0 |  |  |
Senior secured revolving credit facility due November 2022 | Revolving Credit Facility Sub-limit - Foreign Borrower |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Maximum borrowing capacity | 100,000,000.0 |  | 100,000,000.0 |  |  |
Senior secured revolving credit facility due November 2022 | Revolving Credit Facility Sub-limit - Expansion Option |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Maximum borrowing capacity | $ 225,000,000.0 |  | $ 225,000,000.0 |  |  |
Convertible Notes, Due 2018 | Convertible Debt |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Leverage ratio | 3.25 |  | 3.25 |  |  |
Unamortized debt issuance costs | $ 0 |  | $ 0 |  | $ 100,000 |
Financing costs amortization | 100,000 | 200,000 | 100,000 | 400,000 |  |
Debt instrument stated interest rate |  |  |  |  |  | 2.00%
Interest expense | $ 1,000,000 | $ 4,500,000 | $ 2,400,000 | $ 9,100,000 |  |
Convertible Notes, Due 2018 | Convertible Debt | Minimum |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Interest to EBITDA | 3.0 |  | 3.0 |  |  |
Convertible Notes, Due 2018 | Convertible Debt | Maximum |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Leverage ratio | 3.75 |  | 3.75 |  |  |

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- Definition Maximum Percentage Of Capital Stock Guaranteed By Companys Material Non US Subsidiaries For Obligations Under The Senior Credit Facility + References No definition available. + Details
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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + 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 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 3: 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 + Details
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