Condensed Consolidated Statements of Cash Flows (unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash flows from operating activities:
Net earnings	$ 223,122	$ 195,290
Adjustments to reconcile net earnings to cash flows from operating activities:
Depreciation and amortization of property, plant and equipment	18,950	18,865
Amortization of intangible assets	52,289	50,266
Amortization of deferred financing costs	1,181	1,181
Non-cash stock compensation	19,704	15,808
Changes in operating assets and liabilities, net of acquired businesses:
Accounts receivable	(2,321)	(26,735)
Unbilled receivables	(10,244)	3,988
Inventories	(5,452)	(25,312)
Accounts payable and accrued liabilities	(20,371)	17,446
Income taxes	(18,615)	2,175
Other, net	2,540	(10,455)
Cash provided by operating activities	260,783	242,517
Cash flows from investing activities:
Acquisitions of businesses, net of cash acquired	(36,872)	(204,612)
Capital expenditures	(20,532)	(19,390)
Proceeds from sale of assets	1,018	1,123
Other, net	(474)	(1,361)
Cash used in investing activities	(56,860)	(224,240)
Cash flows from financing activities:
Payments under revolving line of credit, net	0	(75,000)
Principal payments on convertible notes	(13,215)	(23,536)
Cash dividends to stockholders	(26,673)	(21,002)
Stock award tax excess windfall benefit	11,070	3,729
Proceeds from stock option exercises	28,314	12,914
Treasury stock sales	1,123	1,059
Redemption premium on convertible debt	19,149	0
Other	(1,107)	(107)
Cash used in financing activities	(19,637)	(101,943)
Effect of foreign currency exchange rate changes on cash	(3,489)	9,299
Net increase/(decrease) in cash and cash equivalents	180,797	(74,367)
Cash and cash equivalents, end of period	338,101	270,394
Cash and cash equivalents, end of period	518,898	196,027
Noncash investing activities:
Cash paid, net of cash acquired	$ 36,872	$ 204,612