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COMMITMENTS AND CONTINGENCIES (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2017 were as follows (in thousands):
Year Ending December 31,
 
2018
$
13,942

2019
11,740

2020
6,836

2021
2,927

2022
2,281

Thereafter
2,559

Total
$
40,285
Product warranty accrual activity
The following table sets forth the activity in the product warranty accrual account for the years ended December 31, 2017, 2016 and 2015 (in thousands):
Accrual balance at January 1, 2015
$
2,792

Accruals for product warranties
3,025

Cost of warranty claims
(3,583
)
Accrual balance at December 31, 2015
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