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Investments - Equity in Earnings (Losses) of Limited Partnerships (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
fund
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Investment in limited partnerships      
Number of real estate limited partnerships that do not meet the criteria of an investment company | fund 1    
Equity in (losses) earnings of limited partnerships $ (822) $ 2,801 $ 7,025
Equity method of accounting      
Investment in limited partnerships      
Equity in (losses) earnings of limited partnerships (448) 1,925 6,273
Fair value option      
Investment in limited partnerships      
Equity in (losses) earnings of limited partnerships $ (374) $ 876 $ 752