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Investments - Schedule of Other Invested Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Summary of Investment Holdings [Line Items]    
Measurement Alternative $ 1,600  
Equity Method 69,075 $ 82,253
Fair Value 290 260
Cost Method   2,906
Common Equity    
Summary of Investment Holdings [Line Items]    
Measurement Alternative 0  
Equity Method 1,914 1,484
Fair Value 0 0
Cost Method   0
Preferred Equity    
Summary of Investment Holdings [Line Items]    
Measurement Alternative 1,600  
Equity Method 10,757 14,197
Fair Value 0 0
Cost Method   2,484
Derivatives    
Summary of Investment Holdings [Line Items]    
Measurement Alternative 0  
Equity Method 0 0
Fair Value 290 260
Cost Method   422
Joint Ventures    
Summary of Investment Holdings [Line Items]    
Measurement Alternative 0  
Equity Method 56,404 66,572
Fair Value $ 0 0
Cost Method   $ 0