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Debt And Credit Arrangements - Senior Secured Revolving Credit Facility (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017 | Aug. 03, 2011
Debt Instrument |  |  |  |
Restricted cash, noncurrent | $ 1,000,000 |  | $ 1,000,000 |
Financing costs amortization | 300,000 | $ 300,000 |  |
Senior Secured Revolving Credit Facility | Revolving Credit Facility |  |  |  |
Debt Instrument |  |  |  |
Debt instrument, term |  |  | 5 years |
Maximum borrowing capacity | $ 450,000,000.0 |  |  |
Line of credit fronting fee (as a percentage) | 0.125% |  |  |
Debt instrument stated interest rate | 1.00% |  |  |
Maximum percentage of capital stock guaranteed by company | 65.00% |  |  |
Senior Secured Revolving Credit Facility | Revolving Credit Facility | Adjusted Base Rate |  |  |  |
Debt Instrument |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.00% |  |  |
Senior secured revolving credit facility due November 2022 | Revolving Credit Facility |  |  |  |
Debt Instrument |  |  |  |
Line of credit fronting fee (as a percentage) | 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 |  |  |
Unamortized debt issuance costs | 2,300,000 |  |  |
Financing costs amortization | 100,000 | 100,000 |  |
Long term debt | $ 247,000,000 |  | $ 239,000,000 |
Debt instrument stated interest rate | 4.25% |  |  |
Interest expense | $ 2,500,000 |  |  |
Line of credit outstanding | 44,900,000 |  |  |
Line of credit remaining borrowing amount | $ 158,100,000 |  |  |
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 |  |  |
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 |  |  |
Senior secured revolving credit facility due November 2022 | Revolving Credit Facility Sub-limit - Foreign Currency |  |  |  |
Debt Instrument |  |  |  |
Maximum borrowing capacity | 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 |  |  |
Senior secured revolving credit facility due November 2022 | Revolving Credit Facility Sub-limit - Expansion Option |  |  |  |
Debt Instrument |  |  |  |
Maximum borrowing capacity | $ 225,000,000.0 |  |  |
Convertible Notes, Due 2018 | Convertible Debt |  |  |  |
Debt Instrument |  |  |  |
Leverage ratio | 3.25 |  |  |
Unamortized debt issuance costs | $ 100,000 |  | $ 100,000 |
Financing costs amortization | 0 | 200,000 |  |
Debt instrument stated interest rate |  |  |  | 2.00%
Interest expense | $ 1,400,000 | $ 4,600,000 |  |
Convertible Notes, Due 2018 | Convertible Debt | Minimum |  |  |  |
Debt Instrument |  |  |  |
Interest to EBITDA | 3.0 |  |  |
Convertible Notes, Due 2018 | Convertible Debt | Maximum |  |  |  |
Debt Instrument |  |  |  |
Leverage ratio | 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 of amortization expense attributable to debt issuance costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(8)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(8)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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