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Performance-Based Common Stock Warrants (Tables)
3 Months Ended
Mar. 31, 2018
Equity [Abstract]  
Purchase Level and Number of Warrants That Will Vest
The table below presents the purchase levels and number of warrants that will vest in each period based upon achieving these purchase levels.
 
Incremental Warrants That Will Vest
Aggregate Level of Purchases by Comcast and Affiliates
January 1, 2016 - December 31, 2017
 
January 1, 2018 - December 31, 2019
 
January 1, 2020 - December 31, 2021
$260 million
100,000

 
100,000

 
75,000

$300 million
75,000

 
75,000

 
75,000

$340 million
75,000

 
75,000

 
75,000

Maximum Potential Warrants Earned by Comcast
250,000

 
250,000

 
225,000

Assumptions Used in Valuation and Weighted Average Fair Value of Warrants
The assumptions we utilized in the Black Scholes option pricing model and the resulting weighted average fair value of the warrants were the following:
 
Three Months Ended March 31,
 
2018
 
2017
Fair value
$16.88
 
$32.32
Price of Universal Electronics Inc. common stock
$52.43
 
$67.98
Risk-free interest rate
2.54%
 
2.04%
Expected volatility
34.53%
 
39.86%
Expected life in years
4.75
 
5.75
Impact to Net Sales in Connection with Warrants and Related Income Tax Benefit
The impact to net sales recorded in connection with the warrants and the related income tax benefit were as follows:
 
Three Months Ended March 31,
(in thousands)
2018
 
2017
Reduction to net sales
471
 
932
Income tax benefit
118
 
348