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Investments (Details 7) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Investments in limited partnerships        
Equity in earnings of limited partnerships $ 772 $ 1,537 $ 361 $ 1,899
Equity method of accounting        
Investments in limited partnerships        
Equity in earnings of limited partnerships 645 1,305 624 1,704
Fair value option        
Investments in limited partnerships        
Equity in earnings of limited partnerships $ 127 $ 232 $ (263) $ 195