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Debt - Debt Acquired in Acquisition (Details) |  | 3 Months Ended |
--- | --- | --- | ---
Sep. 16, 2008 USD ($) subsidiary | Apr. 01, 2018 USD ($) | Dec. 31, 2017 USD ($)
Debt Instrument [Line Items] |  |  |
Debt instrument, face amount |  | $ 300,500,000 | $ 300,800,000
Carrying Amount |  | 294,100,000 | $ 294,300,000
10-year term loan |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, face amount | $ 10,000,000.0 |  |
Maturity period | 10 years |  |
Number of subsidiaries acquired | subsidiary | 1 |  |
Carrying Amount |  | 500,000 |
Quarterly installment payment - principal |  | $ 300,000 |
LIBOR rate | 10-year term loan |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  | 1.50% |

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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 Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: 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(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: 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 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 + Details
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