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Condensed Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Cash Flows from Operating Activities:    
Net income $ 113,231 $ 103,516
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 38,210 32,944
Impairment charge 2,228  
Provision for uncollectible accounts 252 1,448
Provision for (benefit of) deferred income taxes 1,516 (2,055)
Share-based compensation expense 9,927 9,642
Other 1,540 417
Tax benefit from share-based compensation arrangements (4,791) (8,746)
Changes in assets and liabilities:    
Accounts receivable (23,647) (57,126)
Inventories 214 (16,023)
Other assets and liabilities (7,726) 5,203
Accounts payable 99 (2,992)
Deferred revenue 3,088 (706)
Net cash provided by operating activities 134,141 65,522
Cash Flows from Investing Activities:    
Purchases of property and equipment (37,868) (46,873)
Purchase of marketable securities (123,809) (190,370)
Proceeds from the sale and maturities of marketable securities 108,115 10,039
Acquisitions of a businesses, net of cash acquired   (383)
Net cash used by investing activities (53,562) (227,587)
Cash Flows from Financing Activities:    
Repayments on revolving credit facilities, net (15,000) (51,000)
Debt issue costs (57) (127)
Issuance of long term debt   250,097
Repurchases of common stock (76,536) (220,097)
Proceeds from exercises of stock options and employee stock purchase plans 17,554 15,650
Payment of acquisition-related contingent consideration (2,717)  
Tax benefit from share-based compensation arrangements 4,791 8,746
Net cash (used) provided by financing activities (71,965) 3,269
Net effect of changes in exchange rates on cash 3,531 (588)
Net increase (decrease) in cash and cash equivalents 12,145 (159,384)
Cash and cash equivalents at beginning of period 128,994 322,536
Cash and cash equivalents at end of period $ 141,139 $ 163,152