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Condensed Consolidated Statements of Cash Flows (unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Cash flows from operating activities:    
Net earnings $ 108,309 $ 88,979
Adjustments to reconcile net earnings to cash flows from operating activities:    
Depreciation and amortization of property, plant and equipment 9,449 9,256
Amortization of intangible assets 26,018 25,054
Amortization of deferred financing costs 591 591
Non-cash stock compensation 9,954 8,112
Changes in operating assets and liabilities, net of acquired businesses:    
Accounts receivable 20,666 (15,171)
Unbilled Receivables (4,698) (3,010)
Inventories (7,462) (16,359)
Accounts payable and accrued liabilities (35,936) (16,612)
Income taxes payable 13,720 3,424
Other, net 846 2,320
Cash provided by operating activities 141,457 86,584
Cash flows from investing activities:    
Acquisitions of businesses, net of cash acquired 19,007 0
Capital expenditures 10,008 8,813
Proceeds from sale of assets 464 826
Other, net (245) (1,024)
Cash used in investing activities (28,796) (9,011)
Cash flows from financing activities:    
Payments under revolving line of credit, net 0 (85,000)
Principal payments on convertible notes (6,297) (11,968)
Cash dividends to stockholders (13,290) (10,458)
Stock award tax excess windfall benefit 7,505 2,855
Proceeds from stock option exercises 16,873 8,607
Treasury stock sales 600 579
Other 7,665 697
Cash used in financing activities (2,274) (96,082)
Effect of foreign currency exchange rate changes on cash 3,230 9,562
Net increase/(decrease) in cash and cash equivalents 113,617 (8,947)
Cash and cash equivalents, beginning of period 338,101 270,394
Cash and cash equivalents, end of period 451,718  
Noncash investing activities:    
Cash paid, net of cash acquired $ 19,007 $ 0