Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash flows from operating activities
Net income	$ 52,171	$ 47,951
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	9,238	8,324
Amortization of intangible assets	9,952	7,298
Amortization of debt issuance expenses	369	251
Share-based compensation expense	4,661	4,849
Deferred income taxes	74	3,011
Excess tax benefit from share-based compensation	(2,118)	(2,370)
Non-cash interest expense associated with forward starting swaps	1,925	901
Changes in:
Receivables	(15,450)	(22,325)
Inventories	(212)	(12,875)
Trade accounts payable	4,217	6,114
Accrued expenses	2,837	(4,758)
Other - net	(8,922)	(7,244)
Net cash flows provided by operating activities	58,742	29,127
Cash flows from investing activities
Cash purchases of property, plant and equipment	(8,515)	(11,442)
Acquisition of businesses, net of cash acquired		(50,361)
Other - net	(40)	(2,126)
Net cash flows used in investing activities	(8,555)	(63,929)
Cash flows from financing activities
Borrowings under revolving facilities	9,509
Payments under revolving facilities, credit facilities and term loan	(48,009)	(17,983)
Dividends paid	(14,161)	(12,291)
Proceeds from stock option exercises	24,366	16,051
Excess tax benefit from stock-based compensation	2,118	2,370
Purchase of common stock	(10,183)
Unvested shares surrendered for tax withholding	(2,118)	(6)
Other - net	(1,343)
Net cash flows used in financing activities	(39,821)	(11,859)
Effect of exchange rate changes on cash and cash equivalents	4,918	7,073
Net increase (decrease) in cash	15,284	(39,588)
Cash and cash equivalents at beginning of year	230,259	235,136
Cash and cash equivalents at end of period	245,543	195,548
Cash paid for:
Interest	2,537	2,074
Income taxes	9,292	4,712
Significant non-cash activities:
Contingent consideration for acquisition		$ 2,707