EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 31, 2017		Sep. 30, 2017		Jun. 30, 2017		Mar. 31, 2017		Dec. 31, 2016		Sep. 30, 2016		Jun. 30, 2016		Mar. 31, 2016		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Numerator:
Net income	$ 24,181	[1]	$ 106,126	[2]	$ 61,352	[3]	$ 55,844	[4]	$ 53,395	[1]	$ 60,049	[2]	$ 31,317	[3]	$ 53,638	[4]	$ 247,503	$ 198,399	$ 127,478
Denominator:
Basic weighted average shares outstanding (in shares)																	65,739,000	67,462,000	74,111,000
Effect of dilutive securities - stock options and awards (in shares)																	904,000	694,000	743,000
Diluted weighted average shares outstanding (in shares)																	66,643,000	68,156,000	74,854,000
Basic earnings per share (in dollars per share)	$ 0.37	[5]	$ 1.61	[5]	$ 0.93	[5]	$ 0.85	[5]	$ 0.81	[5]	$ 0.90	[5]	$ 0.46	[5]	$ 0.77	[5]	$ 3.76	$ 2.94	$ 1.72
Diluted earnings per share (in dollars per share)	$ 0.36	[5]	$ 1.59	[5]	$ 0.92	[5]	$ 0.84	[5]	$ 0.81	[5]	$ 0.89	[5]	$ 0.45	[5]	$ 0.76	[5]	$ 3.71	$ 2.91	$ 1.70
Anti-dilutive shares excluded from the computation of diluted earnings per share																	157,033	774,502	522,471

[1] 2017 includes special item charges of $2,867 ($1,770 after-tax) for pension settlement charges, $6,590 ($6,198 after-tax) for rationalization and asset impairment charges, $28,616 for the net impact of the U.S. Tax Act and acquisition-related items including $2,264 ($1,708 after-tax) in amortization of step up in value of acquired inventories, $3,616 ($3,102 after-tax) for acquisition transaction and integration costs and a $1,935 adjustment to the bargain purchase gain.

[2] 2017 includes special item charges of $5,283 ($3,260 after-tax) for pension settlement charges and acquisition-related items including $2,314 ($1,745 after-tax) in amortization of step up in value of acquired inventories, $3,273 ($2,229 after-tax) for acquisition transaction and integration costs and a $51,585 bargain purchase gain.

[3] 2017 includes special item charges of $4,498 ($3,494 after-tax) related to acquisition transaction and integration costs.2016 includes special item charges of $34,348 ($33,251 after-tax) primarily related to the loss on deconsolidation of Venezuelan subsidiary and a tax benefit of $7,196 related to the reversal of an income tax valuation allowance as a result of a legal entity change to realign the Company's tax structure.

[4] 2017 includes special item charges of $3,615 ($2,734 after-tax) related to acquisition transaction costs.

[5] The quarterly earnings per share ("EPS") amounts are each calculated independently. Therefore, the sum of the quarterly EPS amounts may not equal the annual totals.