Annual report pursuant to Section 13 and 15(d)

Employee Benefits (Details)

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Employee Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
401(k)      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Employer matching contribution percent 100.00%    
Employer matching percent 6.00%    
Employer contributions $ 5,452 $ 4,957 $ 3,832
GPPP | United Kingdom goodwill amortization      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Employer matching contribution percent 100.00%    
Employer matching percent 6.00%    
Employer contributions $ 190 161 344
RRSP | Canada      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Employer matching contribution percent 100.00%    
Employer matching percent 6.00%    
Employer contributions $ 356 $ 351 $ 774