Background and Basis of Presentation (Tables)
 3 Months Ended
Mar. 31, 2015
Accounting Policies [Abstract]  
Summary of Activity in Product Warranty Accrual Included in Other Accrued Liabilities

The following table summarizes the activity in the product warranty accrual, included in other accrued liabilities:

 

     Three Months Ended  
     March 31,  
     2015      2014  

Product warranty accrual, beginning of period

    $ 17,054       $ 24,838   

Provision for warranty claims

      1,542         2,269   

Warranty claims paid

      (3,230 )       (4,169 ) 
  

 

 

     

 

 

  

Product warranty accrual, end of period

 $ 15,366    $ 22,938   
  

 

 

     

 

 

  

Summary of Earnings, Weighted Average Common Shares and Potential Common Shares Outstanding

The following table presents the basis for the earnings per share computations:

 

 

     Three Months Ended  
     March 31,  
     2015      2014  

Numerator:

      

Net income for basic and diluted earnings per share

    $ 39,476       $ 64,487   

Denominator:

      

Weighted average shares outstanding - basic

      188,480         185,942   

Dilutive effect of equity-based awards

      4,657         4,980   
  

 

 

     

 

 

  

Weighted average common shares outstanding - diluted

   193,137      190,922   
  

 

 

     

 

 

  

Earnings per share:

Basic

 $ 0.21    $ 0.35   

Diluted

 $ 0.20    $ 0.34