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Investments - Fair Value Option (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Fair Value Measurement Inputs and Valuation Techniques [Line Items] (Deprecated 2018-01-31)      
Net Gains and Losses Recognized During the Period $ (2,185) $ 560  
Less Net Gains and Losses Recognized due to Sales 0 0  
Total Changes in Fair Values Included in Current-Period Earnings (2,185) $ 560  
Fair Value Option [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items] (Deprecated 2018-01-31)      
Investments, fair value disclosure 118,556   $ 108,241
Level 1 [Member] | Fair Value Option [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items] (Deprecated 2018-01-31)      
Investments, fair value disclosure 0   0
Level 2 [Member] | Fair Value Option [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items] (Deprecated 2018-01-31)      
Investments, fair value disclosure 118,556   108,241
Level 3 [Member] | Fair Value Option [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items] (Deprecated 2018-01-31)      
Investments, fair value disclosure $ 0   $ 0