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Equity method investment - Financial Position and Results of Operations (Details) - Bankers Healthcare Group, LLC - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]          
Assets $ 606,548   $ 606,548   $ 459,816
Liabilities 451,095   451,095   324,211
Equity interests 155,453   155,453   135,605
Total liabilities and equity 606,548   606,548   $ 459,816
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]          
Revenues 107,982 $ 49,053 170,799 $ 92,804  
Net income $ 67,564 $ 19,102 $ 94,699 $ 38,106