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Investments - Schedule of Other Invested Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Summary of Investment Holdings [Line Items]    
Cost Method $ 5,719 $ 5,784
Equity Method 52,831 42,492
Common Equity    
Summary of Investment Holdings [Line Items]    
Cost Method 138 249
Equity Method 1,047 6,475
Preferred Equity    
Summary of Investment Holdings [Line Items]    
Cost Method 2,484 1,655
Equity Method 9,971 7,522
Warrant    
Summary of Investment Holdings [Line Items]    
Cost Method 3,097 3,880
Equity Method 0 0
Limited partnerships    
Summary of Investment Holdings [Line Items]    
Cost Method 0 0
Equity Method 1,116 1,171
GMSL Joint Ventures    
Summary of Investment Holdings [Line Items]    
Cost Method 0 0
Equity Method $ 40,697 $ 27,324