LEASE COMMITMENTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Rent expense under operating leases	$ 30,274	$ 27,360	$ 26,583
Assets recorded under capital leases
Assets recorded under capital leases, Gross	4,680	4,646
Accumulated depreciation	(2,357)	(2,102)
Assets recorded under capital leases, Net	2,323	2,544
Future minimum payments under capital leases, by year and in the aggregate
2018	678
2019	138
2020	30
Total minimum lease payments	846
Amounts representing interest	(105)
Present value of future minimum lease payments	741
Lease amount due in one year	(606)
Total	135
Future minimum payments under noncancelable operating leases, by year and in the aggregate
2018	21,467
2019	16,751
2020	10,211
2021	7,479
2022	6,470
Subsequent to 2022	13,213
Total minimum lease payments	75,591
Building
Assets recorded under capital leases
Assets recorded under capital leases, Gross	2,415	2,119
Machinery and equipment
Assets recorded under capital leases
Assets recorded under capital leases, Gross	$ 2,265	$ 2,527