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Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Cash flows from operating activities:    
Net earnings $ 158,071 $ 151,416
Adjustments to reconcile net earnings to cash flows from operating activities:    
Depreciation and amortization of property, plant and equipment 12,377 9,702
Amortization of intangible assets 72,998 49,549
Amortization of deferred financing costs 1,821 1,359
Non-cash stock compensation 21,049 18,979
Changes in operating assets and liabilities, net of acquired businesses:    
Accounts receivable 73,056 (16,355)
Unbilled receivables (13,520) 2,296
Inventories (7,905) (3,907)
Accounts payable and accrued liabilities (2,223) (20,023)
Deferred revenues 34,308 292
Income taxes payable 39,013 20,127
Other, net (10,828) (6,363)
Cash provided by operating activities 378,217 207,072
Cash flows from investing activities:    
Acquisitions of businesses, net of cash acquired (2,829) (265,248)
Capital expenditures (14,930) (9,489)
Capitalized software expenditures (3,169) (665)
Proceeds from sale of assets 109 673
Other, net (500) 773
Cash used in investing activities (21,319) (273,956)
Cash flows from financing activities:    
Payments under revolving line of credit, net (370,000) (160,000)
Principal payments on convertible notes 0 (289)
Cash premiums paid on convertible note conversions 0 (915)
Cash dividends to stockholders (35,443) (30,173)
Proceeds from stock based compensation, net 7,576 690
Treasury stock sales 1,032 879
Other (250) (374)
Cash used in financing activities (397,085) (190,182)
Effect of foreign currency exchange rate changes on cash 13,653 1,588
Net decrease in cash and cash equivalents (26,534) (255,478)
Cash and cash equivalents, beginning of period 757,200 778,511
Cash and cash equivalents, end of period $ 730,666 $ 523,033