RECLASSIFICATIONS FOR ACCOUNTING PRONOUNCEMENTS (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net sales	$ 595,393	$ 567,901	$ 1,763,213	$ 1,659,145
Research and development expenses	14,239	14,826	45,234	46,205
Selling expenses	30,361	29,252	94,546	87,765
General and administrative expenses	80,871	71,004	226,808	215,633
Other income, net	3,843	4,457	12,497	12,033
Provision for income taxes	(18,458)	(22,470)	(57,485)	(53,146)
Net earnings	74,483	63,944	192,914	147,141
Receivables, net	615,398		615,398		$ 494,923
Inventories, net	429,267		429,267		378,866
Other assets	20,178		20,178		18,229
Income taxes payable	5,787		5,787		4,564
Deferred revenue	223,686		223,686		214,891
Retained earnings	2,115,166		2,115,166		1,944,324
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Transition Tax for Accumulated Foreign Earnings, Provisional Undistributed Income tax Expense			6,500
Accounting Standards Update 2017-07 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Research and development expenses		251		831
Selling expenses		434		1,434
General and administrative expenses		164		(1,942)
Other income, net		4,136		11,210
Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net sales	(1,139)		(8,650)
Provision for income taxes	510		1,496
Net earnings	(1,913)		(4,711)
Receivables, net	(26,968)		(26,968)		18,363
Inventories, net	25,579		25,579		(23,555)
Other assets	(879)		(879)		878
Income taxes payable	(1,488)		(1,488)
Deferred revenue	1,657		1,657		(2,040)
Retained earnings	(2,437)		(2,437)		(2,274)
Minimum [Member] | Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification			155,000
Maximum [Member] | Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification			165,000
Product [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net sales	495,197	468,073	1,451,560	1,351,076
Cost of Goods and Services Sold	312,702	294,907	936,197	887,311
Product [Member] | Accounting Standards Update 2017-07 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of Goods and Services Sold		2,692		8,865
Product [Member] | Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of Goods and Services Sold	1,284		(2,443)
Service [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net sales	100,196	99,828	311,653	308,069
Cost of Goods and Services Sold	60,173	65,498	196,807	202,393
Service [Member] | Accounting Standards Update 2017-07 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of Goods and Services Sold		595		2,022
Restatement Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net sales	494,058		1,442,910
Provision for income taxes	(17,948)		(55,989)
Net earnings	72,570		188,203
Receivables, net	588,430		588,430		513,286
Inventories, net	454,846		454,846		355,311
Other assets	19,299		19,299		19,107
Income taxes payable	4,299		4,299
Deferred revenue	225,343		225,343		212,851
Retained earnings	2,112,729		2,112,729		$ 1,942,050
Restatement Adjustment [Member] | Product [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of Goods and Services Sold	$ 313,986		$ 933,754
Previously Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Research and development expenses		14,575		45,374
Selling expenses		28,818		86,331
General and administrative expenses		70,840		217,575
Other income, net		321		823
Previously Reported [Member] | Product [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of Goods and Services Sold		292,215		878,446
Previously Reported [Member] | Service [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of Goods and Services Sold		$ 64,903		$ 200,371