COMMITMENTS AND CONTINGENCIES (Tables)

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Future minimum lease commitments under non-cancelable leases

The future minimum lease commitments under these non-cancelable leases at December 31, 2018 were as follows (in thousands):

Year Ending December 31,
2019	$	11,225
2020	9,784
2021	6,850
2022	5,982
2023	4,754
Thereafter	20,040
Total	$	58,635

Product warranty accrual activity

The following table sets forth the activity in the product warranty accrual account for the years ended December 31, 2018, 2017 and 2016 (in thousands):

Accrual balance at January 1, 2016	$	2,234
Accruals for product warranties	2,822
Cost of warranty claims	(2,538		)
Accrual balance at December 31, 2016	2,518
Accruals for product warranties	2,572
Cost of warranty claims	(2,545		)
Accrual balance at December 31, 2017	2,545
Accruals for product warranties	858
Cost of warranty claims	(1,697		)
Accrual balance at December 31, 2018	$	1,706