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Cash and cash equivalents (Details 1) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Cash And Cash Equivalents [Line Items]    
Short-term investments, classified as cash equivalents $ 327,233 $ 265,917
Legg Mason - Western Asset Institutional Cash Reserves [Member]    
Cash And Cash Equivalents [Line Items]    
Short-term investments, classified as cash equivalents 181,155 132,108
JP Morgan US dollar Liquidity Fund Institutional [Member]    
Cash And Cash Equivalents [Line Items]    
Short-term investments, classified as cash equivalents $ 146,078 $ 133,809