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Warranty Costs (Tables)
 3 Months Ended
Mar. 31, 2017
Guarantees [Abstract]  
Changes in Carrying Amount of Accrued Product Warranty Costs

Changes in the carrying amount of accrued product warranty costs for each of the quarters ended March 31, 2017 and March 31, 2016 are as follows:  

 

 

 

March 31, 2017

 

 

March 31, 2016

 

Balance at beginning of period

 

$

9,158

 

 

$

9,468

 

Accrued current period warranty expense

 

 

122

 

 

 

133

 

Payments and adjustments

 

 

(110

)

 

 

(104

)

Balance at end of period

 

$

9,170

 

 

$

9,497