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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