SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES – Adoption of ASU 2017-07 (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of sales	$ 455,822	$ 384,684
Selling, research & development and administrative	112,461	101,282
Total Operating Expenses	615,394	523,297
Operating Income	87,956	78,019
Miscellaneous, net	(867)	(559)
Total Other (Expense) Income	(6,739)	(8,539)
Income before Income Taxes	$ 81,217	69,480
Original Balance | Accounting Standards Update 2017-07
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of sales		384,932
Selling, research & development and administrative		101,516
Total Operating Expenses		523,779
Operating Income		77,537
Miscellaneous, net		(77)
Total Other (Expense) Income		(8,057)
Income before Income Taxes		69,480
Adjustment | Accounting Standards Update 2017-07
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of sales		(248)
Selling, research & development and administrative		(234)
Total Operating Expenses		(482)
Operating Income		482
Miscellaneous, net		(482)
Total Other (Expense) Income		$ (482)