Condensed Consolidated Statements of Cash Flows (unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities:
Net earnings	$ 236,267	$ 223,122
Adjustments to reconcile net earnings to cash flows from operating activities:
Depreciation and amortization of property, plant and equipment	18,742	18,950
Amortization of intangible assets	71,794	52,289
Amortization of deferred financing costs	1,802	1,181
Non-cash stock compensation	26,284	19,704
Changes in operating assets and liabilities, net of acquired businesses:
Accounts receivable	10,636	(2,321)
Unbilled receivables	(12,483)	(10,244)
Inventories	(10,362)	(5,452)
Accounts payable and accrued liabilities	(9,091)	(20,371)
Income taxes	(17,925)	(18,615)
Other, net	(4,657)	2,540
Cash provided by operating activities	311,007	260,783
Cash flows from investing activities:
Acquisitions of businesses, net of cash acquired	(1,007,513)	(36,872)
Capital expenditures	(21,889)	(20,532)
Proceeds from sale of assets	1,349	1,018
Other, net	(35)	(474)
Cash used in investing activities	(1,028,088)	(56,860)
Cash flows from financing activities:
Proceeds from (Repayments of) Notes Payable	800,000	0
Borrowings/(payments) under revolving line of credit, net	(58,000)	0
Principal payments on convertible notes	(1,671)	(13,215)
Cash dividends to stockholders	(16,338)	(26,673)
Stock award tax excess windfall benefit	5,654	11,070
Payments of Debt Issuance Costs	(7,517)	0
Treasury stock sales	1,250	1,123
Proceeds from stock based compensation, net	10,998	28,314
Cash Premium on Convertible Debt	(4,040)	(19,149)
Other	576	(1,107)
Cash provided by/(used in) financing activities	730,912	(19,637)
Effect of foreign currency exchange rate changes on cash	(9,850)	(3,489)
Net increase/(decrease) in cash and cash equivalents	3,981	180,797
Cash and cash equivalents, end of period	370,590	338,101
Cash and cash equivalents, end of period	$ 374,571	$ 518,898