Condensed Consolidated Statements of Cash Flows (unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities:
Net earnings	$ 372,590	$ 339,830
Adjustments to reconcile net earnings to cash flows from operating activities:
Depreciation and amortization of property, plant and equipment	28,269	28,402
Amortization of intangible assets	111,210	82,398
Amortization of deferred financing costs	2,916	1,750
Non-cash stock compensation	40,040	30,143
Changes in operating assets and liabilities, net of acquired businesses:
Accounts receivable	43,101	6,685
Unbilled receivables	(13,257)	(2,698)
Inventories	(15,202)	(2,985)
Accounts payable and accrued liabilities	13,055	(8,617)
Income taxes	(12,643)	(14,258)
Other, net	(3,306)	5,564
Cash provided by operating activities	566,773	466,214
Cash flows from investing activities:
Acquisitions of businesses, net of cash acquired	(1,014,952)	(1,445,549)
Capital expenditures	(33,349)	(29,236)
Proceeds from sale of assets	1,740	1,196
Other, net	(144)	(542)
Cash used in investing activities	(1,046,705)	(1,474,131)
Cash flows from financing activities:
Proceeds from Issuance of Senior Long-term Debt	800,000	0
Proceeds from (Repayments of) Notes Payable	(500,000)	0
Borrowings/(payments) under revolving line of credit, net	290,000	1,050,000
Principal payments on convertible notes	(2,115)	(26,826)
Cash dividends to stockholders	(32,706)	(40,102)
Stock award tax excess windfall benefit	7,763	19,873
Payments of Debt Issuance Costs	(7,717)	(4,551)
Treasury stock sales	1,833	1,623
Proceeds from stock based compensation, net	16,839	40,105
Cash Premium on Convertible Debt	(5,100)	(19,149)
Other	723	(979)
Cash provided by/(used in) financing activities	569,520	1,019,994
Effect of foreign currency exchange rate changes on cash	(198)	4,931
Net increase/(decrease) in cash and cash equivalents	89,390	17,008
Cash and cash equivalents, end of period	370,590	338,101
Cash and cash equivalents, end of period	$ 459,980	$ 355,109