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Basis of Presentation and Consolidation (Tables)
 3 Months Ended
Mar. 31, 2019
Accounting Policies [Abstract]  
Computation of Basic and Diluted Earnings per Share The following table sets forth the computation of basic and diluted earnings per share:
(Number of shares and dollar amounts in thousands except per share amounts)
 
Three Months Ended March 31,
 
 
2019
 
2018
Numerator
 
 
 
 
Numerator for basic and diluted earnings per share - income from continuing operations available to common stockholders
 
$
6,979

 
$
8,285

Denominator
 
 
 
 
Denominator for basic earnings per share - weighted average shares outstanding
 
50,100

 
50,838

Effect of dilutive securities - stock options and other stock units
 
278

 
341

Denominator for diluted earnings per share - adjusted weighted average shares outstanding
 
$
50,378

 
$
51,179

Earnings per share:
 
 
 
 
Basic
 
$
0.14

 
$
0.16

Diluted
 
$
0.14

 
$
0.16
Summary of Activity in Product Warranty Liabilities Warranties – Warranties are provided on the sale of certain of the Company’s products and an accrual for estimated future claims is recorded at the time revenue is recognized. Tire replacement under most of the warranties the Company offers is on a prorated basis. The Company provides for the estimated cost of product warranties based primarily on historical return rates, estimates of the eligible tire population and the value of tires to be replaced. The following table summarizes the activity in the Company’s product warranty liabilities which are recorded in Accrued liabilities and Other long-term liabilities on the Company’s Condensed Consolidated Balance Sheets:
 
 
Three Months Ended March 31,
 
 
2019
 
2018
Reserve at beginning of year
 
$
12,431

 
$
12,093

Additions
 
2,606

 
3,844

Payments
 
(3,198
)
 
(2,743
)
Reserve at period end
 
$
11,839

 
$
13,194