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Commitments and contingencies - Custodian facility (Details)
$ in Thousands, € in Millions
Jun. 30, 2020
USD ($)
Jun. 30, 2020
EUR (€)
Dec. 31, 2019
USD ($)
Short-term Debt [Line Items]      
Revolving credit agreement borrowings $ 472,361   $ 484,287
Custodian bank facility      
Short-term Debt [Line Items]      
Revolving credit agreement borrowings 136,800   0
Cash and investments held on deposit with custodian 214,900   $ 0
Custodian bank facility | EUR denominated borrowings      
Short-term Debt [Line Items]      
Revolving credit agreement borrowings | €   € 0.6  
Custodian bank facility | USD denominated borrowings equivalent      
Short-term Debt [Line Items]      
Revolving credit agreement borrowings $ 700