Operations and Summary of Significant Accounting Policies (Details 6) (USD $) In Thousands, except Share data in Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock-based compensation activity, including both continuing and discontinued operations
Stock-based compensation expense recognized in operating expenses	$ 12,053	$ 10,205	$ 6,133
Tax benefit of stock-based compensation expense in provision for income taxes	4,225	3,610	2,261
Stock-based compensation expense, net of tax	7,828	6,595	3,872
Fair value of shares vested	12,090	10,195	6,194
Proceeds to the Company from the exercise of stock-based compensation	15,057	4,925	214
Tax benefit from exercise of stock-based compensation, including shortfall tax benefits	(2,645)	(233)	(1,554)
Stock-based compensation cost capitalized in inventory	$ 374	$ 335	$ 345
1994 Plan
Stock-Based Compensation
Requisite service period for options to vest	4 years
Expiration period for options granted	7 years
Age after which vesting of options granted accelerates if the grantee ceases to be employed by the entity	60 years
2011 Plan
Stock-Based Compensation
Maximum common stock shares that may be issued under plan	16.3