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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 |  |  |

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