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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash flows from operating activities:      
Net earnings $ 483,360 $ 427,247 $ 322,580
Adjustments to reconcile net earnings to cash flows from operating activities:      
Depreciation and amortization of property, plant and equipment 37,888 36,780 36,728
Amortization of intangible assets 116,860 103,363 86,293
Amortization of deferred financing costs 2,399 2,362 2,362
Non-cash stock compensation 40,773 31,730 25,150
Changes in operating assets and liabilities, net of acquired businesses:      
Accounts receivable (16,455) (33,333) (9,697)
Inventories 18,361 (23,033) (5,687)
Unbilled Receivables (5,122) 11,759 (16,115)
Accounts payable and accrued liabilities 9,209 24,347 52,540
Income taxes payable (15,988) 14,526 10,123
Other, net 6,567 5,870 (4,737)
Cash provided by operating activities 677,852 601,618 499,540
Cash flows from investing activities:      
Acquisitions of businesses, net of cash acquired (1,467,772) (233,594) (536,413)
Capital expenditures (38,405) (40,702) (28,591)
Proceeds from sale of assets 1,315 1,990 6,068
Other, net (683) (3,443) (4,338)
Cash used in investing activities (1,505,545) (275,749) (563,274)
Cash flows from financing activities:      
Proceeds from senior notes 900,000 0 0
Borrowings/(payments) under revolving line of credit, net 100,000 (230,000) 190,000
Principal payments on convertible notes (57,304) (26,457) (23,411)
Debt issuance costs (12,213) 0 0
Cash dividends to stockholders (69,903) (42,090) (35,706)
Treasury stock sales 2,195 2,104 1,697
Stock award tax excess windfall benefit 30,747 12,664 6,364
Proceeds from stock based compensation, net 37,679 28,167 29,047
Redemption Premium Convertible Debt (76,641) 0 0
Other (690) (1,067) (382)
Cash provided by/(used in) financing activities 853,870 (256,679) 167,609
Effect of exchange rate changes on cash 6,312 (1,483) (1,189)
Net increase/(decrease) in cash and cash equivalents 32,489 67,707 102,686
Cash and cash equivalents, beginning of year 338,101 270,394 167,708
Cash and cash equivalents, end of year 370,590 338,101 270,394
Cash paid for:      
Interest 67,804 62,840 64,831
Income taxes, net of refunds received 188,560 150,550 109,327
Noncash investing activities:      
Fair value of assets, including goodwill 1,824,453 256,589 687,017
Liabilities assumed (356,681) (22,995) (150,604)
Cash paid, net of cash acquired $ 1,467,772 $ 233,594 $ 536,413