Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Net earnings	$ 327,053	$ 304,587
Adjustments to reconcile net earnings to cash flows from operating activities:
Depreciation and amortization of property, plant and equipment	19,417	20,089
Amortization of intangible assets	78,758	77,495
Amortization of deferred financing costs	2,002	2,002
Non-cash stock compensation	29,438	30,013
Changes in operating assets and liabilities, net of acquired businesses:
Accounts receivable	40,860	30
Unbilled receivables	(11,172)	(19,705)
Inventories	(7,972)	(6,515)
Accounts payable and accrued liabilities	(3,623)	(6,916)
Income taxes payable	(36,257)	(42,664)
Other, net	(5,556)	(5,286)
Cash provided by operating activities	432,948	353,130
Cash flows from investing activities:
Acquisitions of businesses, net of cash acquired	(589,727)	(2,726)
Capital expenditures	(20,673)	(20,560)
Proceeds from sale of assets	594	764
Other, net	(4,522)	(238)
Cash used in investing activities	(614,328)	(22,760)
Cash flows from financing activities:
Payments under revolving line of credit	315,000	(220,000)
Principal payments on senior notes	0	0
Principal payments on convertible notes	(3,884)	(561)
Cash premiums paid on convertible note conversions	(12,721)	(1,518)
Cash dividends to stockholders	(50,099)	(39,821)
Proceeds from stock based compensation, net	15,315	21,686
Stock award tax excess windfall benefit	8,781	12,058
Treasury stock sales	1,477	1,456
Other	(628)	355
Cash used in financing activities	273,241	(226,345)
Effect of foreign currency exchange rate changes on cash	(23,720)	1,537
Net increase in cash and cash equivalents	68,141	105,562
Cash and cash equivalents, beginning of period	610,430	459,720
Cash and cash equivalents, end of period	$ 678,571	$ 565,282