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Interim financial statements - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Aug. 17, 2020
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Accounting Policies [Abstract]        
Investments restricted for statutory reserve funds   $ 535,700   $ 483,400
Restricted cash and cash equivalent   $ 21,100   $ 39,700
Common stock, issued (in shares) 3,026,340      
Common stock, par value (in usd per share) $ 1 $ 1   $ 1
Issuance of new Common Stock $ 109,000 $ 108,961 $ 0