CONSOLIDATED STATEMENTS OF CASH FLOWS $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Statement of Cash Flows [Abstract]
Cash and Cash Equivalents	$ 512,144	$ 519,090
CASH PROVIDED BY OPERATING ACTIVITIES:
Net earnings	282,425	107,223	$ 166,626
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	66,462	71,010	57,513
Deferred income taxes	14,604	25,968	5,613
Stock-based compensation arrangements	34,170	31,018	27,797
Loss on assets held for sale	0	23,588	0
Other, net	(483)	(31,256)	11,992
Increase (decrease) in cash, net of acquisitions, resulting from changes in:
Accounts receivable	29,057	(7,758)	(10,704)
Inventories	17,425	(32,961)	51,170
Prepaid expenses	(3,427)	1,217	(7,706)
Other assets	(2,663)	(12,027)	10,750
Accounts payable	(22,449)	21,558	(33,465)
Deferred revenue	8,081	(9,220)	2,928
Accrued payroll and other liabilities	6,599	17,076	(10,147)
Accrued income taxes	(74,888)	84,352	66,302
Pension and other long-term liabilities	13,918	(5,590)	2,582
Net cash provided by operating activities	374,157	308,252	319,751
CASH FLOWS FROM INVESTING ACTIVITIES:
Additions to property and equipment	(30,773)	(42,109)	(35,940)
Business acquisitions, net of cash acquired	(26,764)	0	(419,203)
Proceeds from sale of assets	3,017	3,686	7,331
Payments for (Proceeds from) Other Investing Activities	(15,500)	0	0
Proceeds from Divestiture of Businesses	25,920	0	0
Net cash used by investing activities	(44,100)	(38,423)	(447,812)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net proceeds of long-term debt, including current portion	0	0	524,560
Repayment of long-term debt	0	(97,500)	(367,435)
Repurchase of common stock	(243,706)	0	(66,057)
Dividends paid	(88,123)	(82,605)	(65,920)
Proceeds from shares issued pursuant to stock-based compensation plans	29,124	58,241	11,966
Tax paid for net share exercises and issuance of vested restricted stock units	16,228	10,731	5,991
Other financing activities	(11)	(17)	13
Net cash (used) provided by financing activities	(318,944)	(132,612)	31,136
Effect of exchange rate changes on cash	(18,059)	20,524	(14,511)
Net (decrease) increase in cash and cash equivalents	(6,946)	157,741	(111,436)
Cash and cash equivalents, beginning of year	519,090	361,349	472,785
Cash and cash equivalents, end of year	$ 512,144	$ 519,090	$ 361,349