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Recently issued accounting standards (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Operating lease assets $ 107,543  
Operating lease liabilities $ 116,652  
ASU 2016-02    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Operating lease assets   $ 105,300
Operating lease liabilities   $ 106,600