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Warranty Costs (Tables)
 6 Months Ended
Jun. 30, 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 June 30, 2017 and June 30, 2016 are as follows:  

 

 

 

June 30, 2017

 

 

June 30, 2016

 

Balance at beginning of period

 

$

9,158

 

 

$

9,468

 

Accrued current period warranty expense

 

 

355

 

 

 

930

 

Payments and adjustments

 

 

(1,161

)

 

 

(1,161

)

Balance at end of period

 

$

8,352

 

 

$

9,237