Share-Based Compensation Expense (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Arrangements with Employees and Nonemployees [Abstract]
Share-based compensation expense	$ 11,300,000	$ 8,600,000	$ 7,300,000
Share-based compensation expense recorded in cost of sales	2,000,000	1,300,000	1,300,000
Accelerated share-based compensation related to separation agreement			200,000
Tax benefits associated with share-based compensation expense	$ 0	$ 0	$ 0