Warranty Costs (Tables)

6 Months Ended

Jun. 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 June 30, 2018 and 2017 are as follows:

	June 30, 2018			June 30, 2017
Balance at beginning of period	$	7,479		$	9,158
Accrued current period warranty expense		514			355
Payments and adjustments		(1,356	)		(1,161	)
Balance at end of period	$	6,637		$	8,352