NEW ACCOUNTING STANDARDS - Significant changes and quantitative impact for adoption of ASC 606 (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 01, 2018	Dec. 31, 2018	Jan. 02, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
NEW ACCOUNTING STANDARDS
Cumulative effect on retained earnings after-tax adjustment		$ (126)
Consolidated Balance Sheets
Receivables, net		326,602	$ 325,608	$ 332,091
Inventories		210,573	212,916	206,603
Total current assets		556,256	633,900	634,070
Total assets		1,476,359	1,940,253	1,940,423
Accrued expenses - other		21,014	20,516	20,560
Total current liabilities		558,585	651,413	651,457
Total liabilities		1,011,275	1,190,878	1,190,922
(Accumulated deficit) retained earnings		(210,579)	91,690	91,816
Total shareholders' equity		465,084	749,375	749,501	$ 613,724	$ 515,546
Total liabilities and shareholders' equity		$ 1,476,359	$ 1,940,253	$ 1,940,423
Difference between Revenue Guidance in Effect before and after Topic 606
NEW ACCOUNTING STANDARDS
Cumulative effect on retained earnings after-tax adjustment	$ (126)
Consolidated Balance Sheets
Receivables, net	(6,483)
Inventories	6,313
Total current assets	(170)
Total assets	(170)
Accrued expenses - other	(44)
Total current liabilities	(44)
Total liabilities	(44)
(Accumulated deficit) retained earnings	(126)
Total shareholders' equity	(126)
Total liabilities and shareholders' equity	$ (170)