CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net profit (loss)	$ 21,874	$ 49,132
Adjustments to reconcile net profit to net cash provided by operating activities:
Deferred taxes	14,501	13,165
Depreciation, Depletion and Amortization	12,647	12,544
Stock-based compensation	21,265	15,504
Excess tax benefit from share-based payment arrangements	(21,849)	(18,140)
Impairment of goodwill	40,693	24,665
Asset Impairment Charges	26,320	0
Provision for Doubtful Accounts	1,200	2,660
Other Noncash Income (Expense)	0	80
Changes in assets and liabilities, net of acquired assets and liabilities:
Accounts receivable	(5,936)	(17,352)
Inventories	467	(5,735)
Prepaid expenses and other assets	256	(1,620)
Accounts payable	(318)	(3,888)
Accrued and other long-term liabilities	(671)	(669)
Deferred revenues	8,415	12,674
Net cash provided by operating activities	118,864	83,020
CASH FLOWS FROM INVESTING ACTIVITIES:
Payments to Acquire Businesses, Net of Cash Acquired	(7,652)	0
Purchase of property, plant and equipment	(15,172)	(31,485)
Purchase of marketable securities	(213,990)	(53,862)
Maturities of marketable securities	32,229	16,067
Proceeds from Sale of Available-for-sale Securities	6,943	1,296
Other assets	(2,347)	2,336
Net cash used in investing activities	(199,989)	(65,648)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock	28,291	40,194
Common stock repurchase	(95,105)	(9,796)
Excess tax benefit from share-based payment arrangements	21,849	18,140
Employees' taxes paid upon the vesting of restricted stock units	(3,931)	(1,719)
Other payments for financing activities	(6)	0
Net cash provided by financing activities	(48,902)	46,819
Effect of foreign exchange rate changes on cash and cash equivalents	(520)	41
Net increase (decrease) in cash and cash equivalents	(130,547)	64,232
Cash and cash equivalents, beginning of the period	306,386	240,675
Cash and cash equivalents, end of the period	$ 175,839	$ 304,907