Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash flows from operating activities:
Net income (loss)	$ 250,679	$ 262,332	$ (85,235)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Loss (gain) on disposal of property and equipment, net	(5,773)	1,113	518
Depreciation and amortization	35,021	39,952	46,861
Deferred income taxes	26,306	(5,147)	5,788
Stock-based compensation	42,659	48,165	30,388
Excess tax benefit from stock-based compensation	(1,892)	(3,343)	(850)
Other, net	6,724	6,427	9,467
Changes in operating assets and liabilities:
Accounts receivable, net	66,987	(105,370)	(8,343)
Inventories	(2,619)	(44,546)	53,904
Other assets	(5,480)	5,395	18,742
Accounts payable and accrued liabilities	(30,775)	9,136	21,865
Accrued payroll and related expenses	10,383	44,605	(11,175)
Accrued warranty	(672)	15,444	(10,901)
Income taxes payable	(5,132)	26,793	2,369
Deferred profit	(13,648)	20,908	(5,797)
Other liabilities	(9,464)	14,556	(4,272)
Net cash provided by operating activities	363,304	336,420	63,329
Cash flows from investing activities:
Proceeds from sales of investments	424,665	288,788	246,934
Proceeds from maturities of investments	130,774	178,689	25,926
Purchases of investments	(514,403)	(521,932)	(328,445)
Capital expenditures	(25,501)	(19,908)	(11,891)
Proceeds from sale of property and equipment	6,742	0	1,267
Decrease (increase) in restricted cash and cash equivalents	(2,002)	6,602	(13,003)
Purchase of intangible assets and other	0	0	(2,194)
Net cash provided by (used in) investing activities	20,275	(67,761)	(81,406)
Cash flows from financing activities:
Proceeds from employee stock compensation plans	197,700	106,194	7,251
Proceeds from senior convertible notes, net of issuance costs	684,250	0	0
Proceeds from the issuance of other debt obligations	0	0	110,632
Payments on other debt obligations	(98)	(67)	(110,608)
Repayments of lines of credit, net	0	(5)	(1,255)
Repurchases of common stock	(987,037)	(273,067)	(30,656)
Excess tax benefit from stock-based compensation	1,892	3,343	850
Net cash used in financing activities	(103,293)	(163,602)	(23,786)
Effects of exchange rate changes on cash and cash equivalents	(2,440)	(49)	(422)
Net change in cash and cash equivalents	277,846	105,008	(42,285)
Cash and cash equivalents at beginning of period	247,055	142,047	184,332
Cash and cash equivalents at end of period	524,901	247,055	142,047
Supplemental disclosures:
Interest	11,411	1,448	2,203
Income taxes, net	$ 27,328	$ 9,641	$ 3,906