Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net earnings	$ 696,067	$ 646,033	$ 538,293
Adjustments to reconcile net earnings to cash flows from operating activities:
Depreciation and amortization of property, plant and equipment	38,185	40,890	37,756
Amortization of intangible assets	166,076	156,394	151,434
Amortization of deferred financing costs	4,136	4,003	3,918
Non-cash stock compensation	61,766	63,027	53,133
Gain (Loss) on Disposition of Business	(70,860)	0	0
Changes in operating assets and liabilities, net of acquired businesses:
Accounts receivable	52,597	(404)	32,800
Inventories	(1,150)	6,349	(12,687)
Unbilled Receivables	(21,844)	(10,305)	(14,754)
Accounts payable and accrued liabilities	(153)	(20,455)	23,305
Income taxes payable	3,069	(46,619)	(6,427)
Other, net	936	1,528	(4,218)
Cash provided by operating activities	928,825	840,441	802,553
Cash flows from investing activities:
Acquisitions of businesses, net of cash acquired	(1,762,883)	(305,379)	(1,074,413)
Capital expenditures	(36,260)	(37,644)	(42,528)
Proceeds from Divestiture of Businesses	105,624	0	0
Proceeds from sale of assets	1,126	1,506	2,174
Other, net	(5,939)	(6,588)	(1,096)
Cash used in investing activities	(1,698,332)	(348,105)	(1,115,863)
Cash flows from financing activities:
Proceeds from senior notes	900,000	0	800,000
Payment of senior notes	0	0	(500,000)
Proceeds from (Repayments of) Lines of Credit	180,000	(250,000)	150,000
Principal payments on convertible notes	(4,006)	(561)	(3,702)
Debt issuance costs	(8,044)	0	(7,717)
Cash dividends to stockholders	(100,334)	(79,859)	(49,092)
Treasury stock sales	2,889	2,751	2,449
Stock award tax excess windfall benefit	22,228	21,081	11,709
Proceeds from stock based compensation, net	18,312	10,463	7,944
Redemption Premium Convertible Debt	(13,126)	(1,518)	(9,124)
Other	(1,677)	(461)	1,166
Cash used in financing activities	996,242	(298,104)	403,633
Effect of foreign currency exchange rate changes on cash	(58,654)	(43,522)	(1,193)
Net increase in cash and cash equivalents	168,081	150,710	89,130
Cash and cash equivalents, beginning of year	610,430	459,720	370,590
Cash and cash equivalents, end of year	778,511	610,430	459,720
Cash paid for:
Interest	79,225	74,446	94,648
Income taxes, net of refunds received	280,801	300,969	210,540
Noncash investing activities:
Fair value of assets, including goodwill	1,876,984	324,717	1,275,827
Liabilities assumed	(114,101)	(19,338)	(201,414)
Cash paid, net of cash acquired	$ 1,762,883	$ 305,379	$ 1,074,413