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Condensed Consolidated Statements of Cash Flows (unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Cash flows from operating activities:    
Net earnings $ 304,587 $ 236,267
Adjustments to reconcile net earnings to cash flows from operating activities:    
Depreciation and amortization of property, plant and equipment 20,089 18,742
Amortization of intangible assets 77,495 71,794
Amortization of deferred financing costs 2,002 1,802
Non-cash stock compensation 30,013 26,284
Changes in operating assets and liabilities, net of acquired businesses:    
Accounts receivable 30 10,636
Unbilled receivables (19,705) (12,483)
Inventories (6,515) (10,362)
Accounts payable and accrued liabilities (6,916) (9,091)
Income taxes payable (42,664) (17,925)
Other, net (5,286) (4,657)
Cash provided by operating activities 353,130 311,007
Cash flows from investing activities:    
Acquisitions of businesses, net of cash acquired (2,726) (1,007,513)
Capital expenditures (20,560) (21,889)
Proceeds from sale of assets 764 1,349
Other, net (238) (35)
Cash used in investing activities (22,760) (1,028,088)
Cash flows from financing activities:    
Payments under revolving line of credit (220,000) (58,000)
Proceeds from senior notes 0 800,000
Principal payments on convertible notes (561) (1,671)
Cash premiums paid on convertible note conversions (1,518) (4,040)
Debt issuance costs 0 (7,517)
Cash dividends to stockholders (39,821) (16,338)
Proceeds from stock based compensation, net 21,686 10,998
Stock award tax excess windfall benefit 12,058 5,654
Treasury stock sales 1,456 1,250
Other 355 576
Cash used in financing activities (226,345) 730,912
Effect of foreign currency exchange rate changes on cash 1,537 (9,850)
Net increase in cash and cash equivalents 105,562 3,981
Cash and cash equivalents, beginning of period 459,720 370,590
Cash and cash equivalents, end of period $ 565,282 $ 374,571