Share-Based Compensation (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Share based compensation expense [Line Items]
Total share-based compensation expense	$ 3,256,000	$ 3,545,000
Cash proceeds received from stock option excercises	0
Stock Option Expense	1,000,000	1,000,000
Unrecognized compensation expense [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Method of Measuring Cost of Award, Vesting Period	4 years
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value	2,000,000
Restricted Stock Expense	1,000,000	1,000,000
Share Based Compensation Arrangment Roll Forward [Abstract]
Outstanding Beginning Shares	3,713
Granted Shares	0
Exercised Shares	(5)
Forfeited or Expired Shares	(410)
Outstanding Ending Shares	3,298		3,713
Shares Exercisable	2,546
Outstanding Beginning Weighted Average Exercise Price	$ 17.85
Granted Weighted Average Exercise Price	$ 0
Exercised Weighted Average Exercise Price	$ 8.57
Forfeited or Expired Weighted Average Exercise Price	$ 20.34
Outstanding Ending Weighted Average Exercise Price	$ 17.55		$ 17.85
Exercisable Weighted Average Exercise Price	$ 16.37
Outstanding Beginning Weighted Average Remaining Contractual Term	4 years		5 years
Outstanding Ending Weighted Average Remaining Contractual Term	4 years		5 years
Exercisable Weighted Average Remaing Contractual Term	3 years
Outstanding Beginning Intrinsic Value	9,744,000
Exercised Intrinsic Value	79,000
Outstanding Ending Intrinsic Value	16,622,000		9,744,000
Exercisable Intrinsic Value	15,306,000
Stock Options [Member]
Unrecognized compensation expense [Line Items]
Unrecognized share-based compensation expense	6,000,000
Unrecognized share-based compensaion expense - years	2 years
Share-based Compensation Arrangement by Share-based Payment Award, Method of Measuring Cost of Award, Vesting Period	4 years
Share-based Compensation Arrangement by Share-based Payment Award, Method of Measuring Cost of Award	expense was estimated on the date of grant using the Black-Scholes-Merton option pricing model.
Restricted Stock [Member]
Unrecognized compensation expense [Line Items]
Unrecognized share-based compensation expense	18,000,000
Unrecognized share-based compensaion expense - years	2 years
Cost of Sales [Member]
Share based compensation expense [Line Items]
Total share-based compensation expense	123,000	103,000
Selling and Adminstrative Expense [Member]
Share based compensation expense [Line Items]
Total share-based compensation expense	2,843,000	3,126,000
Research and Development Expense [Member]
Share based compensation expense [Line Items]
Total share-based compensation expense	$ 290,000	$ 316,000