Note 7. Cash, Cash Equivalents, and Marketable Securities (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 27, 2008
Investment [Line Items]
Cash and cash equivalents	$ 1,325,072,000	$ 901,294,000	$ 605,619,000	$ 765,689,000
Marketable securities, current and noncurrent	439,102,000	102,578,000
Total cash, cash equivalents, marketable securities, and investments	1,764,174,000	1,003,872,000
Available-for-sale securities, gross realized gains	0	0	900,000
Available-for-sale securities, gross realized losses	0	0	0
Marketable securities, in loss position for 12 months or greater, estimated fair value		5,970,000
Marketable securities, in loss position for 12 months or greater, gross unrealized losses		33,000
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Investment [Line Items]
Marketable securities, current and noncurrent	0	1,698,000
U.S. debt [Member]
Investment [Line Items]
Marketable securities, current and noncurrent	46,439,000	53,320,000
Marketable securities, in loss position for 12 months or greater, estimated fair value		0
Marketable securities, in loss position for 12 months or greater, gross unrealized losses		0
Foreign Government Obligations [Member]
Investment [Line Items]
Marketable securities, current and noncurrent	25,115,000	4,142,000
Marketable securities, in loss position for 12 months or greater, estimated fair value		0
Marketable securities, in loss position for 12 months or greater, gross unrealized losses		0
US Government Debt Securities [Member]
Investment [Line Items]
Marketable securities, current and noncurrent	3,502,000	2,004,000
Foreign Debt [Member]
Investment [Line Items]
Marketable securities, current and noncurrent	364,046,000	41,414,000
Marketable securities, in loss position for 12 months or greater, estimated fair value		5,970,000
Marketable securities, in loss position for 12 months or greater, gross unrealized losses		33,000
Cash [Member]
Investment [Line Items]
Cash and cash equivalents	1,322,183,000	889,065,000
Commercial Paper [Member]
Investment [Line Items]
Cash and cash equivalents	0	1,500,000
Money Market Funds [Member]
Investment [Line Items]
Cash and cash equivalents	$ 2,889,000	$ 10,729,000