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Investments (Details 7) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Investments in limited partnerships    
Asset recorded $ 53,230 $ 58,159
Private equity    
Investments in limited partnerships    
Asset recorded 34,790 35,228
Mezzanine debt    
Investments in limited partnerships    
Asset recorded 4,908 6,010
Real estate    
Investments in limited partnerships    
Asset recorded 9,156 12,509
Fair value option | Real estate    
Investments in limited partnerships    
Asset recorded $ 4,376 $ 4,412