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Equity method investment - Financial Position and Results of Operations (Details) - Bankers Healthcare Group, LLC - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]          
Assets $ 695,300   $ 695,300   $ 459,816
Liabilities 499,460   499,460   324,211
Equity interests 195,840   195,840   135,605
Total liabilities and equity 695,300   695,300   $ 459,816
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]          
Revenues 108,770 $ 59,133 279,569 $ 151,937  
Net income $ 61,364 $ 30,933 $ 156,064 $ 69,039