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Pensions - Narratives (Details)
€ in Thousands, £ in Thousands, $ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2017
EUR (€)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
GBP (£)
Dec. 31, 2018
GBP (£)
Jul. 01, 2017
GBP (£)
May 31, 2014
GBP (£)
Defined Benefit Plan Disclosure              
Defined benefit plan, expected future contribution by employer     $ 1,615   £ 1,272    
Defined benefit obligation, monthly contribution by employer $ 135 € 106 30 £ 24      
Estimated net loss amortized from accumulated other comprehensive income (loss) into net periodic pension cost in the next fiscal year     240        
Maximum              
Defined Benefit Plan Disclosure              
Defined benefit plan, payment obligation guaranteed by parent company     $ 10,414     £ 8,200 £ 8,200