v3.10.0.1

Interest Rate Swap (Details) - Designated as Hedging Instrument - Interest Rate Swap - Cash Flow Hedge - USD ($) | 1 Months Ended |  |
--- | --- | --- | ---
Apr. 30, 2017 | Sep. 30, 2018 | Dec. 31, 2017
Derivative [Line Items] |  |  |
Fixed interest rate | 1.78% |  |
Notional amount | $ 500,000,000 | $ 400,000,000 |
Reduction in notional amount per year | $ 100,000,000 |  |
Term of contract | 5 years |  |
Effective fixed interest rate on long-term debt |  | 4.03% |
Other Assets |  |  |
Derivative [Line Items] |  |  |
Fair value of derivative |  | $ 8,500,000 | $ 2,900,000
LIBOR |  |  |
Derivative [Line Items] |  |  |
Basis spread on variable rate | 0.75% |  |

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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 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 Reference 2: 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=64930785&loc=d3e28551-108399 + Details
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- Definition Period the derivative contract is outstanding, 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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