Warranty Costs (Tables)

9 Months Ended

Sep. 30, 2018

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 September 30, 2018 and 2017 are as follows:

	September 30, 2018			September 30, 2017
Balance at beginning of period	$	7,479		$	9,158
Accrued current period warranty expense		99			511
Payments and adjustments		(2,049	)		(2,047	)
Balance at end of period	$	5,529		$	7,622