CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities
Net income	$ 337,257	$ 271,109	$ 282,807
Adjustments to reconcile net income to net cash provided by operating activities:
Loss (gain) on sale of fixed assets - net	315	(28)	(114)
Loss (gain) on sale of businesses - net	(9,273)	22,298	(18,070)
Asset impairments	0	205	795
Depreciation and amortization	38,314	37,854	35,694
Amortization of intangible assets	45,902	49,038	42,426
Amortization of debt issuance expenses	1,320	1,295	1,612
Share-based compensation expense	24,405	20,326	20,048
Deferred income taxes	(33,742)	(17,308)	(339)
Excess tax benefit from share-based compensation	0	0	(5,265)
Non-cash interest expense associated with forward starting swaps	6,655	6,851	7,030
Pension settlement	0	3,554	0
Changes in (net of the effect from acquisitions and divestitures):
Receivables	(15,803)	302	8,832
Inventories	760	32,747	4,557
Other current assets	(20,031)	(22,006)	(2,728)
Trade accounts payable	12,556	73	(2,828)
Accrued expenses	19,710	(5,470)	(16,672)
Other — net	24,408	(923)	2,536
Net cash flows provided by operating activities	432,753	399,917	360,321
Cash flows from investing activities
Purchases of property, plant and equipment	(43,858)	(38,242)	(43,776)
Acquisition of businesses, net of cash acquired	(38,161)	(510,001)	(195,013)
Proceeds from fixed asset disposals	6,011	49	894
Proceeds from sale of businesses, net of cash sold	21,795	39,064	27,677
Other — net	(533)	(69)	(273)
Net cash flows (used in) investing activities	(54,746)	(509,199)	(210,491)
Cash flows from financing activities
Borrowings under revolving credit facilities	33,000	501,529	414,032
Payment of 2.58% Senior Euro Notes	0	0	(88,420)
Payments under revolving credit facilities	(200,618)	(520,125)	(333,630)
Debt issuance costs	0	(246)	(1,739)
Dividends paid	(111,172)	(102,650)	(96,172)
Proceeds from stock option exercises	22,935	30,240	19,217
Excess tax benefit from share-based compensation	0	0	5,265
Purchases of common stock	(29,074)	(57,272)	(210,822)
Unvested shares surrendered for tax withholding	(6,228)	(4,928)	(3,259)
Settlement of foreign exchange contracts	13,736	0	0
Net cash flows provided by (used in) financing activities	(277,421)	46,548	(295,528)
Effect of exchange rate changes on cash and cash equivalents	39,400	(29,320)	(35,421)
Net increase (decrease) in cash	139,986	(92,054)	(181,119)
Cash and cash equivalents at beginning of year	235,964	328,018	509,137
Cash and cash equivalents at end of period	375,950	235,964	328,018
Cash paid for:
Interest	36,818	37,067	33,502
Income taxes - net	104,852	109,399	112,613
Significant non-cash activities:
Contingent consideration for acquisition	$ 0	0	4,705
3.2% Senior Notes, due June 2023
Cash flows from financing activities
Proceeds from issuance of Senior Notes		100,000	0
3.37% Senior Notes, due June 2025
Cash flows from financing activities
Proceeds from issuance of Senior Notes		$ 100,000	$ 0