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Fair Value of Financial Instruments Investments Measured Using the Net Asset Value per Share Practical Expedient (Tables)
 9 Months Ended
Sep. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table Text Block]
The following table summarizes investments for which fair value is measured using the net asset value per share practical expedient at September 30, 2018:
September 30, 2018
 
Fair Value (in thousands)
 
Unfunded Commitments
 
Redemption Frequency
 
Redemption Notice Period
Limited liability investments, at fair value
 
$
21,252

 
n/a
 
n/a
 
n/a
The following table summarizes investments for which fair value is measured using the net asset value per share practical expedient at December 31, 2017:
December 31, 2017
 
Fair Value (in thousands)
 
Unfunded Commitments
 
Redemption Frequency
 
Redemption Notice Period
Limited liability investments, at fair value
 
$
20,500

 
n/a
 
n/a
 
n/a