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Condensed Consolidated Statements of Cash Flows (unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash flows from operating activities:    
Net earnings $ 124,914 $ 108,309
Adjustments to reconcile net earnings to cash flows from operating activities:    
Depreciation and amortization of property, plant and equipment 9,342 9,449
Amortization of intangible assets 34,099 26,018
Amortization of deferred financing costs 837 591
Non-cash stock compensation 12,977 9,954
Changes in operating assets and liabilities, net of acquired businesses:    
Accounts receivable 27,590 20,666
Unbilled receivables (13,136) (4,698)
Inventories (11,687) (7,462)
Accounts payable and accrued liabilities (25,510) (35,936)
Income taxes 16,348 13,720
Other, net (4,506) 846
Cash provided by operating activities 171,268 141,457
Cash flows from investing activities:    
Acquisitions of businesses, net of cash acquired (2,240) (19,007)
Capital expenditures (11,205) (10,008)
Proceeds from sale of assets 236 464
Other, net (1) (245)
Cash used in investing activities (13,210) (28,796)
Cash flows from financing activities:    
Borrowings/(payments) under revolving line of credit, net (100,000) 0
Principal payments on convertible notes (52) (6,297)
Cash dividends to stockholders 0 (13,290)
Stock award tax excess windfall benefit 4,364 7,505
Treasury stock sales 642 600
Proceeds from stock based compensation, net 6,229 16,873
Cash Premium on Convertible Debt (109) (6,576)
Other 122 (1,089)
Cash provided by/(used in) financing activities (88,804) (2,274)
Effect of foreign currency exchange rate changes on cash (9,822) 3,230
Net increase/(decrease) in cash and cash equivalents 59,432 113,617
Cash and cash equivalents, end of period 370,590 338,101
Cash and cash equivalents, end of period $ 430,022 $ 451,718