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Self-Funded insurance - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Insurance [Abstract]          
Estimated accrued liability $ 1,567   $ 1,567   $ 1,316
Reinsured limit of aggregate expense $ 4,757 $ 4,709 $ 16,072 $ 14,875