RECLASSIFICATIONS FOR ACCOUNTING PRONOUNCEMENTS (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Product sales	$ 511,676	$ 459,774	$ 956,363	$ 883,003
Cost of product sales	324,184	302,794	623,495	592,404
Cost of service sales	69,614	69,849	136,634	136,895
Research and development expenses	15,054	15,788	30,995	31,379
Selling expenses	32,665	29,055	64,185	58,513
General and administrative expenses	76,705	70,435	145,937	144,629
Other income, net	3,971	3,729	8,654	7,576
Provision for income taxes	(21,693)	(22,061)	(39,027)	(30,676)
Net earnings	74,788	50,650	118,431	83,197
Receivables, net	575,142		575,142		$ 494,923
Inventories, net	436,250		436,250		378,866
Other assets	18,292		18,292		18,229
Income taxes payable	4,957		4,957		4,564
Deferred revenue	231,187		231,187		214,891
Retained earnings	2,047,250		2,047,250		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]
Cost of product sales		3,055		6,173
Cost of service sales		705		1,427
Research and development expenses		287		580
Selling expenses		495		1,000
General and administrative expenses		(1,003)		(2,106)
Other income, net		3,539		7,074
Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Product sales	(5,477)		(7,511)
Cost of product sales	(4,095)		(3,727)
Provision for income taxes	371		986
Net earnings	(1,011)		(2,798)
Receivables, net	(26,158)		(26,158)		18,363
Inventories, net	27,557		27,557		(23,555)
Other assets	(879)		(879)		878
Income taxes payable	(983)		(983)
Deferred revenue	2,029		2,029		(2,040)
Retained earnings	(526)		(526)		(2,274)
Restatement Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Product sales	506,199		948,852
Cost of product sales	320,089		619,768
Provision for income taxes	(21,322)		(38,041)
Net earnings	73,777		115,633
Receivables, net	548,984		548,984		513,286
Inventories, net	463,807		463,807		355,311
Other assets	17,413		17,413		19,107
Income taxes payable	3,974		3,974
Deferred revenue	233,216		233,216		212,851
Retained earnings	$ 2,046,724		2,046,724		$ 1,942,050
Scenario, Previously Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of product sales		299,739		586,231
Cost of service sales		69,144		135,468
Research and development expenses		15,501		30,799
Selling expenses		28,560		57,513
General and administrative expenses		71,438		146,735
Other income, net		$ 190		$ 502
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			130,000
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			$ 140,000