Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Net earnings	$ 527,900	$ 476,564
Adjustments to reconcile net earnings to cash flows from operating activities:
Depreciation and amortization of property, plant and equipment	36,776	27,954
Amortization of intangible assets	221,518	149,149
Amortization of deferred financing costs	5,463	4,080
Non-cash stock compensation	67,598	60,480
Gain on sale of assets	(9,393)	0
Changes in operating assets and liabilities, net of acquired businesses:
Accounts receivable	30,074	(1,660)
Unbilled receivables	(27,186)	3,684
Inventories	(19,577)	(5,916)
Accounts payable and accrued liabilities	48,276	17,273
Deferred revenue	50,554	19,692
Income taxes	(48,370)	(52,728)
Other, net	(17,900)	(5,199)
Cash provided by operating activities	865,733	693,373
Cash flows from investing activities:
Acquisitions of businesses, net of cash acquired	(88,070)	(277,587)
Capital expenditures	(35,898)	(26,933)
Capitalized software expenditures	(8,043)	(1,528)
Proceeds from sale of assets	10,614	866
Other, net	(6,932)	1,564
Cash used in investing activities	(128,329)	(303,618)
Cash flows from financing activities:
Payments under revolving line of credit, net	(880,000)	(180,000)
Principal payments on convertible notes	0	(4,010)
Cash premiums paid on convertible note conversions	0	(13,308)
Cash dividends to stockholders	(106,480)	(90,632)
Proceeds from stock-based compensation, net	32,932	13,895
Treasury stock sales	3,194	2,576
Other	179	(7,816)
Cash used in financing activities	(950,175)	(279,295)
Effect of foreign currency exchange rate changes on cash	61,187	(6,701)
Net (decrease)/increase in cash and cash equivalents	(151,584)	103,759
Cash and cash equivalents, beginning of period	757,200	778,511
Cash and cash equivalents, end of period	$ 605,616	$ 882,270