CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 145,832us-gaap_NetIncomeLoss	$ 64,295us-gaap_NetIncomeLoss	$ 58,691us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Deferred taxes	25,481us-gaap_DeferredIncomeTaxExpenseBenefit	21,204us-gaap_DeferredIncomeTaxExpenseBenefit	17,783us-gaap_DeferredIncomeTaxExpenseBenefit
Depreciation and amortization	17,856	16,825	17,811
Stock-based compensation	39,823us-gaap_ShareBasedCompensation	26,438us-gaap_ShareBasedCompensation	21,483us-gaap_ShareBasedCompensation
Excess tax benefit from share-based payment arrangements	(21,393)	(27,103)	(17,187)
Impairment of goodwill	0us-gaap_GoodwillImpairmentLoss	40,693us-gaap_GoodwillImpairmentLoss	36,591us-gaap_GoodwillImpairmentLoss
Impairment of long lived assets	0	26,320	0
Other	10,106us-gaap_OtherNoncashIncomeExpense	4,142us-gaap_OtherNoncashIncomeExpense	4,517us-gaap_OtherNoncashIncomeExpense
Changes in assets and liabilities, excluding the effects of business combinations:
Accounts receivable	(27,229)	(11,981)	(11,666)
Inventories	(1,999)us-gaap_IncreaseDecreaseInInventories	1,158us-gaap_IncreaseDecreaseInInventories	(5,718)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other assets	(2,924)	(392)	(3,853)
Accounts payable	2,887	(186)	(6)
Accrued and other long-term liabilities	22,692	9,662	2,943
Deferred revenues	15,767	14,901	12,389
Net cash provided by operating activities	226,899	185,976	133,778
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition, net of cash acquired	0	(7,652)	0
Purchase of property, plant and equipment	(24,092)	(19,412)	(38,333)
Purchase of marketable securities	(437,152)	(303,917)	(67,511)
Proceeds from maturities of marketable securities	176,810	90,917	24,901
Proceeds from Sale and Maturity of Marketable Securities	82,990	31,741	297
Other assets	(183)	(2,411)	2,346
Net cash used in investing activities	(201,627)	(210,734)	(78,300)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock	18,028	34,196	42,327
Common stock repurchase	(98,233)	(95,107)	(47,203)
Excess tax benefit from share-based payment arrangements	21,393	27,103	17,187
Employees' taxes paid upon the vesting of restricted stock units	(7,608)	(4,363)	(2,106)
Net cash (used in) provided by financing activities	(66,420)	(38,171)	10,205
Effect of foreign exchange rate changes on cash and cash equivalents	(1,934)	(504)	28
Net (decrease) increase in cash and cash equivalents	(43,082)	(63,433)	65,711
Cash and cash equivalents, beginning of year	242,953	306,386	240,675
Cash and cash equivalents, end of year	$ 199,871	$ 242,953	$ 306,386

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- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

+ Details

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Period Type:	duration

- Definition

The cash inflow from the additional capital contribution to the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

+ Details

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- Definition

The cash inflow associated with the sale or maturity (principal being due) of securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

+ Details

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- Definition

The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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- Definition

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.

+ References

+ Details

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