Share-Based Compensation (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Share based compensation expense [Line Items]
Total share-based compensation expense	$ 3,219,000	$ 3,256,000
Cash proceeds received from stock option excercises	0
Stock Option Expense	1,000,000	1,000,000
Unrecognized compensation expense [Line Items]
Restricted Stock Expense	2,000,000	1,000,000
Share Based Compensation Arrangment Roll Forward [Abstract]
Outstanding Beginning Shares	3,126
Granted Shares	0
Exercised Shares	(41)
Forfeited or Expired Shares	(2)
Outstanding Ending Shares	3,083		3,126
Shares Exercisable	2,470
Outstanding Beginning Weighted Average Exercise Price	$ 18.93
Granted Weighted Average Exercise Price	$ 0
Exercised Weighted Average Exercise Price	$ 9.70
Forfeited or Expired Weighted Average Exercise Price	$ 29.21
Outstanding Ending Weighted Average Exercise Price	$ 19.04		$ 18.93
Exercisable Weighted Average Exercise Price	$ 18.14
Outstanding Beginning Weighted Average Remaining Contractual Term	4 years		4 years
Outstanding Ending Weighted Average Remaining Contractual Term	4 years		4 years
Exercisable Weighted Average Remaing Contractual Term	3 years
Outstanding Beginning Intrinsic Value	17,461,000
Exercised Intrinsic Value	560,000
Outstanding Ending Intrinsic Value	23,126,000		17,461,000
Exercisable Intrinsic Value	20,601,000
Stock Options [Member]
Unrecognized compensation expense [Line Items]
Unrecognized share-based compensation expense	5,000,000
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
ShareBasedCompensationArrangementByShareBasedPaymentAwardDescription	Stock options generally vest in equal annual installments over a four-year period and expire eight years after the grant date
Stock Options [Member] | Stock Option 2013 Plan [Member]
Unrecognized compensation expense [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Method of Measuring Cost of Award, Vesting Period	4 years
Restricted Stock [Member]
Unrecognized compensation expense [Line Items]
Unrecognized share-based compensation expense	15,000,000
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
Cost of Sales [Member]
Share based compensation expense [Line Items]
Total share-based compensation expense	96,000	123,000
Selling and Adminstrative Expense [Member]
Share based compensation expense [Line Items]
Total share-based compensation expense	2,850,000	2,843,000
Research and Development Expense [Member]
Share based compensation expense [Line Items]
Total share-based compensation expense	$ 273,000	$ 290,000