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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2016
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 June 30, 2016:
 
Quoted Prices in Active Markets
(Level 1)
 
Significant Other Observable Inputs
(Level 2)
 
Significant Unobservable Inputs
(Level 3)
 
June 30,
2016
Assets
 
 
 
 
 
 
 
U.S. government debt securities
$

 
$
165,858

 
$

 
$
165,858

Equity securities
31,539

 
7,481

 

 
39,020

Preferred stock

 

 
120,000

 
120,000

Other

 
308

 

 
308

Total
$
31,539

 
$
173,647

 
$
120,000

 
$
325,186

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, 2015:
 
Quoted Prices in Active Markets
(Level 1)
 
Significant Other Observable Inputs
(Level 2)
 
Significant Unobservable Inputs
(Level 3)
 
December 31,
2015
Assets
 
 
 
 
 
 
 
U.S. government debt securities
$

 
$
207,704

 
$

 
$
207,704

Equity securities
65,850

 
17,803

 

 
83,653

Other

 
405

 

 
405

Total
$
65,850

 
$
225,912

 
$

 
$
291,762