Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash Flows from Operating Activities:
Net income	$ 46,578us-gaap_ProfitLoss	$ 46,593us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash (used) provided by operating activities:
Depreciation and amortization	16,154	13,394
Gain on disposal of property and equipment	(33)	(18)
Amortization on marketable securities, net	91
Increase (decrease) in deferred compensation liability	58	(86)
Provision for uncollectible accounts	509us-gaap_ProvisionForDoubtfulAccounts	451us-gaap_ProvisionForDoubtfulAccounts
Provision for (benefit of) deferred income taxes	565us-gaap_DeferredIncomeTaxExpenseBenefit	(835)us-gaap_DeferredIncomeTaxExpenseBenefit
Share-based compensation expense	4,652us-gaap_ShareBasedCompensation	4,108us-gaap_ShareBasedCompensation
Tax benefit from share-based compensation arrangements	(7,713)	(6,747)
Changes in assets and liabilities:
Accounts receivable	(51,438)	(21,707)
Inventories	(10,142)us-gaap_IncreaseDecreaseInInventories	2,200us-gaap_IncreaseDecreaseInInventories
Other assets	15,479	1,312
Accounts payable	(4,332)	1,857
Accrued liabilities	(26,225)	(10,231)
Deferred revenue	1,153	3,227
Net cash (used) provided by operating activities	(14,644)	33,518
Cash Flows from Investing Activities:
Purchases of property and equipment	(23,017)	(11,298)
Purchase of marketable securities	(140,448)
Proceeds from the sale and maturities of marketable securities	3,228
Acquisitions of a businesses, net of cash acquired	(383)	(1,161)
Acquisition of intangible asset		(175)
Net cash used by investing activities	(160,620)	(12,634)
Cash Flows from Financing Activities:
Borrowings on revolving credit facilities, net	500	38,000
Debt issue costs	(90)us-gaap_DebtIssuanceCosts	(139)us-gaap_DebtIssuanceCosts
Payment of notes payable		(253)us-gaap_RepaymentsOfSecuredDebt
Issuance of long term debt	150,000
Repurchases of common stock	(133,647)	(70,279)
Proceeds from exercises of stock options and employee stock purchase plans	12,325	10,964
Tax benefit from share-based compensation arrangements	7,713	6,747
Net cash provided (used) by financing activities	36,801	(14,960)
Net effect of changes in exchange rates on cash	(1,913)	1,221
Net (decrease) increase in cash and cash equivalents	(140,376)	7,145
Cash and cash equivalents at beginning of period	322,536	279,058
Cash and cash equivalents at end of period	$ 182,160	$ 286,203

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Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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