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Credit Agreement (Details) $ in Thousands, £ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2018 GBP (£) | Jun. 30, 2018 USD ($) | Dec. 30, 2017 USD ($)
Senior Loan Agreement |  |  |
Borrowings outstanding |  | $ 20,789 |
Revolving credit facility |  |  |
Senior Loan Agreement |  |  |
Revolving credit facility, maximum capacity |  | 125,000 |
Borrowings outstanding |  | 20,800 | $ 0
Period of repayment | 12 months |  |
Revolving credit facility | United States |  |  |
Senior Loan Agreement |  |  |
Borrowings outstanding |  | 17,500 |
Revolving credit facility | United Kingdom |  |  |
Senior Loan Agreement |  |  |
Borrowings outstanding | £ | £ 2.5 |  |
Letters of credit |  |  |
Senior Loan Agreement |  |  |
Revolving credit facility, maximum capacity |  | 15,000 |
Amounts outstanding under letters of credit |  | $ 3,900 |

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- Definition Period of time between issuance and maturity of debt instrument, 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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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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