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Investments - Schedule of Other Invested Assets - Common Stock Purchase Warrants and Call Options (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Investment Holdings [Line Items]    
Fair Value $ 51,519 $ 49,682
Derivative    
Investment Holdings [Line Items]    
Cost 6,562 8,063
Gains 180 428
Losses (2,929) (3,648)
Fair Value 3,813 4,843
Warrant    
Investment Holdings [Line Items]    
Cost 6,332 6,383
Gains 180 428
Losses (2,919) (2,600)
Fair Value 3,593 4,211
Call options    
Investment Holdings [Line Items]    
Cost 230 1,680
Gains 0 0
Losses (10) (1,048)
Fair Value $ 220 $ 632