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Equity method investment - Financial Position and Results of Operations (Details) - Bankers Healthcare Group, LLC - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]      
Assets $ 340,760   $ 330,030
Liabilities 232,978   224,837
Membership interests 107,782   105,193
Total liabilities and membership interests 340,760   $ 330,030
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]      
Revenues 43,750 $ 34,235  
Net income $ 19,003 $ 16,012