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Condensed Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash Flows from Operating Activities:    
Net income $ 46,025 $ 46,578
Adjustments to reconcile net income to net cash provided (used) by operating activities:    
Depreciation and amortization 18,546 16,154
Impairment charge 1,110  
Benefit of deferred income taxes 2,520 565
Share-based compensation expense 4,922 4,652
Other 586 625
Tax benefit from share-based compensation arrangements (2,063) (7,713)
Changes in assets and liabilities:    
Accounts receivable (21,504) (51,438)
Inventories 1,764 (10,142)
Other assets and liabilities (27,516) (10,746)
Accounts payable (1,801) (4,332)
Deferred revenue 637 1,153
Net cash provided (used) by operating activities 23,226 (14,644)
Cash Flows from Investing Activities:    
Purchases of property and equipment (21,906) (23,017)
Purchase of marketable securities (72,079) (140,448)
Proceeds from the sale and maturities of marketable securities 70,186 3,228
Acquisitions of a businesses, net of cash acquired   (383)
Net cash used by investing activities (23,799) (160,620)
Cash Flows from Financing Activities:    
Borrowings on revolving credit facilities, net 49,000 500
Debt issue costs (57) (90)
Issuance of long term debt   150,000
Repurchases of common stock (53,480) (133,647)
Proceeds from exercises of stock options and employee stock purchase plans 5,760 12,325
Payment of acquisition-related contingent consideration (2,084)  
Tax benefit from share-based compensation arrangements 2,063 7,713
Net cash provided by financing activities 1,202 36,801
Net effect of changes in exchange rates on cash 3,330 (1,913)
Net increase (decrease) in cash and cash equivalents 3,959 (140,376)
Cash and cash equivalents at beginning of period 128,994 322,536
Cash and cash equivalents at end of period $ 132,953 $ 182,160