Share-Based Compensation (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Share based compensation expense [Line Items]
Total share-based compensation expense	$ 3,304,000	$ 3,539,000	$ 6,560,000	$ 7,084,000
Cash proceeds received from stock option excercises			1,000,000
Stock Option Expense	1,000,000	1,000,000	2,000,000	2,000,000
Unrecognized compensation expense [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value			3,000,000
Restricted Stock Expense	2,000,000	2,000,000	5,000,000	5,000,000
Share Based Compensation Arrangment Roll Forward [Abstract]
Outstanding Beginning Shares			3,713
Granted Shares			186
Exercised Shares			(192)
Forfeited or Expired Shares			(417)
Outstanding Ending Shares	3,290		3,290		3,713
Shares Exercisable	2,640		2,640
Outstanding Beginning Weighted Average Exercise Price			$ 17.85
Granted Weighted Average Exercise Price			$ 23.35
Exercised Weighted Average Exercise Price			$ 7.34
Forfeited or Expired Weighted Average Exercise Price			$ 20.34
Outstanding Ending Weighted Average Exercise Price	$ 18.45		$ 18.45		$ 17.85
Exercisable Weighted Average Exercise Price	$ 17.45		$ 17.45
Outstanding Beginning Weighted Average Remaining Contractual Term			5 years		5 years
Outstanding Ending Weighted Average Remaining Contractual Term			5 years		5 years
Exercisable Weighted Average Remaing Contractual Term			4 years
Outstanding Beginning Intrinsic Value			9,744,000
Exercised Intrinsic Value			3,072,000
Outstanding Ending Intrinsic Value	26,149,000		26,149,000		9,744,000
Exercisable Intrinsic Value	23,467,000		23,467,000
Stock Options [Member]
Unrecognized compensation expense [Line Items]
Unrecognized share-based compensation expense	12,000,000		12,000,000
Unrecognized share-based compensaion expense - years			3 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	20,000,000		20,000,000
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	126,000	102,000	249,000	205,000
Selling and Adminstrative Expense [Member]
Share based compensation expense [Line Items]
Total share-based compensation expense	2,877,000	3,121,000	5,720,000	6,247,000
Research and Development Expense [Member]
Share based compensation expense [Line Items]
Total share-based compensation expense	$ 301,000	$ 316,000	$ 591,000	$ 632,000