Operations and Summary of Significant Accounting Policies (Details 3) (USD $) In Thousands, except Share data in Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stock-based compensation activity, including both continuing and discontinued operations
Stock-based compensation expense recognized in operating expenses	$ 6,133	$ 3,338	$ 1,746
Tax benefit of stock-based compensation expense in provision for income taxes	2,261	1,212	544
Stock-based compensation expense, net of tax	3,872	2,126	1,202
Fair value of shares vested	6,194	3,577	1,690
Proceeds to the Company from the exercise of stock-based compensation	214	17,948	7,627
Tax benefit from exercise of stock-based compensation, including (shortfall) tax benefits	(1,554)	(2,430)	(445)
Stock-based compensation cost capitalized in inventory	$ 345	$ 284	$ 45
1994 Plan
Stock-Based Compensation
Requisite service period for options to vest (in years)	4 years
Expiration period for options granted (in years)	P7Y
Age after which vesting of options granted accelerates if the grantee ceases to be employed by the entity (in years)	60
2011 Plan
Stock-Based Compensation
Maximum common stock shares that may be issued under plan	16.3