CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash flows from operating activities
Net income	$ 61,300	$ 52,171
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	8,948	9,238
Amortization of intangible assets	10,891	9,952
Amortization of debt issuance expenses	425	369
Share-based compensation expense	5,612	4,661
Deferred income taxes	(117)	74
Excess tax benefit from share based compensation	(2,439)	(2,118)
Non-cash interest expense associated with forward starting swaps	1,872	1,925
Changes in:
Receivables	(14,843)	(15,450)
Inventories	(3,115)	(212)
Other current assets	(3,513)	(7,144)
Trade accounts payable	6,303	4,217
Accrued expenses	1,043	2,837
Other - net	(172)	(1,778)
Net cash flows provided by operating activities	72,195	58,742
Cash flows from investing activities
Cash purchases of property, plant and equipment	(7,625)	(8,515)
Acquisition of businesses, net of cash acquired	(34,648)
Other - net	(57)	(40)
Net cash flows used in investing activities	(42,330)	(8,555)
Cash flows from financing activities
Borrowings under revolving facilities for acquisitions	34,648
Borrowings under revolving facilities	5,438	9,509
Payments under revolving facilities	(305)	(48,009)
Dividends paid	(16,575)	(14,161)
Proceeds from stock option exercises	10,758	24,366
Excess tax benefit from stock-based compensation	2,439	2,118
Purchase of common stock	(33,115)	(10,183)
Unvested shares surrendered for tax withholding	(1,735)	(2,118)
Other		(1,343)
Net cash flows provided by (used in) financing activities	1,553	(39,821)
Effect of exchange rate changes on cash and cash equivalents	(9,237)	4,918
Net increase in cash	22,181	15,284
Cash and cash equivalents at beginning of year	318,864	230,259
Cash and cash equivalents at end of period	341,045	245,543
Cash paid for:
Interest	545	2,537
Income taxes, net	$ 7,002	$ 9,292