Derivatives (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) instrument	Dec. 31, 2019 USD ($)	Dec. 31, 2019 GBP (£)	Dec. 31, 2018 GBP (£) instrument
Derivative [Line Items]
Receivables	$ 60,094	$ 64,492
Derivative loss	$ 29,000
Foreign Currency Forward
Derivative [Line Items]
Notional amount | £			£ 53,000,000.0
Receivables		$ 3,100
Notional amount | £				£ 46,000,000.0
Number of foreign currency forward transactions | instrument	2			2
Foreign Currency Forward | Other Current Liabilities
Derivative [Line Items]
Derivative liability	$ 3,800