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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2019
Fair Value Disclosures [Abstract]  
Summary of Placement in the Fair Value Hierarchy of Financial Assets that are Measured at Fair Value on a Recurring Basis The following table presents the placement in the fair value hierarchy of financial assets that are measured at fair value on a recurring basis, including the items for which the fair value option has been elected, at March 31, 2019:
 
Quoted Prices in Active Markets
(Level 1)
 
Significant Other Observable Inputs
(Level 2)
 
Significant Unobservable Inputs
(Level 3)
 
March 31,
2019
Assets
 
 
 
 
 
 
 
U.S. government debt securities
$

 
$
74,738

 
$

 
$
74,738

Equity securities
1,474

 
315

 

 
1,789

Other

 
508

 
248

 
756

Total
$
1,474

 
$
75,561

 
$
248

 
$
77,283

The following table presents the placement in the fair value hierarchy of financial assets that are measured at fair value on a recurring basis, including the items for which the fair value option has been elected, at December 31, 2018:
 
Quoted Prices in Active Markets
(Level 1)
 
Significant Other Observable Inputs
(Level 2)
 
Significant Unobservable Inputs
(Level 3)
 
December 31,
2018
Assets
 
 
 
 
 
 
 
U.S. government debt securities
$

 
$
119,340

 
$

 
$
119,340

Equity securities
1,626

 
556

 

 
2,182

Other

 
468

 
191

 
659

Total
$
1,626

 
$
120,364

 
$
191

 
$
122,181

Schedule of Changes in Level 3 Investments The following table summarizes the changes in the Level 3 investments in preferred stock during the three months ended March 31, 2019.
 
Three Months Ended 
 March 31, 2019
Beginning balance
$
191

Dividend income from investments in preferred stock
12

Net unrealized appreciation in the fair value of the investments in preferred stock
45

Ending balance
$
248