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Summary of significant accounting policies (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Jan. 01, 2019
Summary Of Significant Accounting Policies [Line Items]    
Operating lease right of use asset $ 46,519  
Operating lease, liability $ 54,445  
Accounting Standards Update 2016-02    
Summary Of Significant Accounting Policies [Line Items]    
Operating lease right of use asset   $ 58,000
Operating lease, liability   $ 58,000