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v3.19.1

Debt - Additional Information (Details) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jul. 31, 2017 USD ($) | Jun. 29, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |
Debt issuance costs | $ 1,400,000 | $ 1,700,000 |  |
Debt covenant, interest coverage ratio | 4.0 |  |  |
Debt covenant, leverage ratio (no more than) | 3.0 |  |  |
Senior Facilities Agreement |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt, use of proceeds, amount permitted to dispose of assets without restriction (up to) | $ 25,000,000 |  |  |
Loan Notes | Loan Notes due 2018 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt maximum borrowing capacity |  |  |  | $ 50,000,000
Debt stated interest rate | 6.19% |  |  |
Loan Notes | Loan Notes due 2021 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt stated interest rate | 3.67% |  |  |
Loan Notes | Loan Notes due 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt stated interest rate | 4.88% |  |  |
Loan Notes | Loan Notes due 2026 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt stated interest rate | 4.94% |  |  |
Revolving credit facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt maximum borrowing capacity |  |  | $ 150,000,000 |
Debt issuance costs |  |  | 1,000,000 |
Debt, weighted average interest rate | 3.58% | 3.05% |  |
Uncommitted Facilities |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Accordion facility amount |  |  | $ 50,000,000 |

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- Definition Debt Instrument, Use Of Proceeds, Amount Permitted To Dispose Of Assets Without Restriction + References No definition available. + Details
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- Definition Line of Credit Facility, Accordion Feature, Increase Limit + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
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