Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities:
Net earnings	$ 476,564	$ 487,470
Adjustments to reconcile net earnings to cash flows from operating activities:
Depreciation and amortization of property, plant and equipment	27,954	28,454
Amortization of intangible assets	149,149	119,766
Amortization of deferred financing costs	4,080	3,002
Non-cash stock compensation	60,480	47,035
Changes in operating assets and liabilities, net of acquired businesses:
Accounts receivable	(1,660)	35,215
Unbilled receivables	3,684	(9,164)
Inventories	(5,916)	(7,047)
Accounts payable and accrued liabilities	36,965	(8,688)
Income taxes payable	(52,728)	(35,165)
Other, net	(5,199)	(1,311)
Cash provided by operating activities	693,373	659,567
Cash flows from investing activities:
Acquisitions of businesses, net of cash acquired	(277,587)	(1,024,779)
Capital expenditures	(26,933)	(27,503)
Proceeds from sale of assets	866	724
Other, net	36	(5,093)
Cash used in investing activities	(303,618)	(1,056,651)
Cash flows from financing activities:
Borrowings/(payments) under revolving line of credit, net	(180,000)	590,000
Principal payments on convertible notes	(4,010)	(4,006)
Cash premiums paid on convertible note conversions	(13,308)	(13,126)
Debt issuance costs	(6,763)	0
Cash dividends to stockholders	(90,632)	(75,210)
Proceeds from stock based compensation, net	13,895	19,237
Stock award tax excess windfall benefit	0	11,593
Treasury stock sales	2,576	2,117
Other	(1,053)	(1,273)
Cash provided by/(used in) financing activities	(279,295)	529,332
Effect of foreign currency exchange rate changes on cash	(6,701)	(42,100)
Net increase/(decrease) in cash and cash equivalents	103,759	90,148
Cash and cash equivalents, beginning of period	778,511	610,430
Cash and cash equivalents, end of period	$ 882,270	$ 700,578