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Condensed Consolidated Statements of Cash Flows (unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Cash flows from operating activities:    
Net earnings $ 147,226 $ 124,914
Adjustments to reconcile net earnings to cash flows from operating activities:    
Depreciation and amortization of property, plant and equipment 9,666 9,342
Amortization of intangible assets 39,037 34,099
Amortization of deferred financing costs 1,002 837
Non-cash stock compensation 14,571 12,977
Changes in operating assets and liabilities, net of acquired businesses:    
Accounts receivable 4,582 27,590
Unbilled receivables (8,346) (13,136)
Inventories (4,712) (11,687)
Accounts payable and accrued liabilities (12,887) (25,510)
Income taxes 24,829 16,348
Other, net (2,340) (4,506)
Cash provided by operating activities 212,628 171,268
Cash flows from investing activities:    
Acquisitions of businesses, net of cash acquired (2,146) (2,240)
Capital expenditures (10,478) (11,205)
Proceeds from sale of assets 341 236
Other, net (233) (1)
Cash used in investing activities (12,516) (13,210)
Cash flows from financing activities:    
Borrowings/(payments) under revolving line of credit, net (150,000) (100,000)
Principal payments on convertible notes (433) (52)
Cash Premium on Convertible Debt (1,174) (109)
Cash dividends to stockholders (19,863) 0
Stock award tax excess windfall benefit 7,511 4,364
Treasury stock sales 729 642
Proceeds from stock based compensation, net 8,026 6,229
Other 573 122
Cash provided by/(used in) financing activities (154,631) (88,804)
Effect of foreign currency exchange rate changes on cash (2,316) (9,822)
Net increase/(decrease) in cash and cash equivalents 43,165 59,432
Cash and cash equivalents, end of period 459,720 370,590
Cash and cash equivalents, end of period $ 502,885 $ 430,022