XML 95 R84.htm IDEA: XBRL DOCUMENT v3.10.0.1
Investments - Equity Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]    
Equity securities $ 217,153 $ 47,500
Common stocks    
Debt Securities, Available-for-sale [Line Items]    
Equity securities 63,298 4,928
Perpetual preferred stocks    
Debt Securities, Available-for-sale [Line Items]    
Equity securities $ 153,855 $ 42,572