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Warranty Costs (Tables)
 12 Months Ended
Dec. 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 years ended December 31, are as follows:

 

 

 

December 31, 2017

 

 

December 31, 2016

 

 

December 31, 2015

 

Balance at beginning of period

 

$

9,158

 

 

$

9,468

 

 

$

7,792

 

Accrued current period warranty expense

 

 

1,057

 

 

 

1,355

 

 

 

4,429

 

Acquired warranty reserve

 

 

—

 

 

 

1,636

 

 

 

—

 

Payments and adjustments

 

 

(2,736

)

 

 

(3,301

)

 

 

(2,753

)

Balance at end of period

 

$

7,479

 

 

$

9,158

 

 

$

9,468