Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net earnings	$ 602,739	$ 561,109	$ 512,611
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation	42,044	38,991	37,167
Amortization	56,665	49,690	47,524
Deferred tax (benefit) provision	(12,784)	11,203	2,302
Share-based compensation	18,687	18,285	17,579
Swiss tax reform (Note 14)	0	(15,833)	0
Provisional one-time charge on US tax reform	0	0	3,597
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	0	0	(18,674)
Other	(2,399)	133	(2,559)
Increase (decrease) in cash resulting from changes in:
Trade accounts receivable, net	(4,495)	(31,408)	(19,540)
Inventories	(3,836)	(4,603)	(21,195)
Other current assets	(4,763)	(335)	622
Trade accounts payable	(17,803)	(12,221)	33,671
Taxes payable	14,049	(6,176)	(1,528)
Accruals and other	36,595	(5,385)	(26,572)
Net Cash Provided by (Used in) Operating Activities	724,699	603,450	565,005
Cash flows from investing activities:
Proceeds from sale of property, plant and equipment	3,106	1,422	8,190
Purchase of property, plant and equipment	(92,494)	(97,341)	(142,726)
Acquisitions	(6,242)	(2,004)	(5,527)
Net hedging settlements on intercompany loans	4,730	1,160	(1,119)
Net cash used in investing activities	(100,360)	(99,083)	(138,944)
Cash flows from financing activities:
Proceeds from borrowings	1,489,040	1,435,081	940,615
Repayments of borrowings	(1,483,869)	(1,176,784)	(876,324)
Proceeds from exercise of stock options	26,719	47,581	24,600
Repurchases of common stock	(774,998)	(774,999)	(474,999)
Acquisition contingent consideration paid	0	(10,000)	0
Other financing activities	(800)	1,753	(1,914)
Net cash provided by (used in) financing activities	(743,908)	(477,368)	(388,022)
Effect of exchange rate changes on cash and cash equivalents	6,038	2,676	(8,616)
Net increase (decrease) in cash and cash equivalents	(113,531)	29,675	29,423
Cash and cash equivalents:
Cash and Cash Equivalents, at Carrying Value, Beginning	207,785	178,110	148,687
Cash and Cash Equivalents, at Carrying Value, End	94,254	207,785	178,110
Supplemental disclosures of cash flow information:
Interest	37,772	37,499	34,451
Taxes	$ 134,674	$ 129,347	$ 132,410