Share-Based Compensation (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Share based compensation expense [Line Items]
Total share-based compensation expense	$ 3,492,000	$ 3,595,000	$ 10,053,000	$ 10,679,000
Cash proceeds received from stock option excercises			2,000,000
Stock Option Expense	1,000,000	1,000,000	3,000,000	4,000,000
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			6,000,000
Restricted Stock Expense	3,000,000	2,000,000	8,000,000	7,000,000
Share Based Compensation Arrangment Roll Forward [Abstract]
Outstanding Beginning Shares			3,713
Granted Shares			186
Exercised Shares			(310)
Forfeited or Expired Shares			(420)
Outstanding Ending Shares	3,169		3,169		3,713
Shares Exercisable	2,542		2,542
Outstanding Beginning Weighted Average Exercise Price			$ 17.85
Granted Weighted Average Exercise Price			$ 23.35
Exercised Weighted Average Exercise Price			$ 7.43
Forfeited or Expired Weighted Average Exercise Price			$ 20.34
Outstanding Ending Weighted Average Exercise Price	$ 18.85		$ 18.85		$ 17.85
Exercisable Weighted Average Exercise Price	$ 17.91		$ 17.91
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			4 years
Outstanding Beginning Intrinsic Value			9,744,000
Exercised Intrinsic Value			5,334,000
Outstanding Ending Intrinsic Value	20,164,000		20,164,000		9,744,000
Exercisable Intrinsic Value	18,369,000		18,369,000
Stock Options [Member]
Unrecognized compensation expense [Line Items]
Unrecognized share-based compensation expense	7,000,000		7,000,000
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
Stock Options [Member] | Stock Option 2001 Plan [Member]
Unrecognized compensation expense [Line Items]
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 under the Company’s 2001 Omnibus Equity Incentive Plan (“2001 Plan”) generally vest in equal annual installments over a four-year period and expire ten 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
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			In May 2013, the Company’s stockholders approved the Company’s 2013 Equity Incentive Plan (“2013 Plan”). Since the approval of the 2013 Plan, all stock options have been granted under the 2013 Plan, and the Company will not grant any further stock options under its 2001 Plan. Stock options under the 2013 Plan generally vest in equal annual installments over a four-year period and expire eight years after the grant date
Restricted Stock [Member]
Unrecognized compensation expense [Line Items]
Unrecognized share-based compensation expense	23,000,000		23,000,000
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
Cost of Sales [Member]
Share based compensation expense [Line Items]
Total share-based compensation expense	136,000	126,000	385,000	331,000
Selling and Adminstrative Expense [Member]
Share based compensation expense [Line Items]
Total share-based compensation expense	2,958,000	3,170,000	8,679,000	9,417,000
Research and Development Expense [Member]
Share based compensation expense [Line Items]
Total share-based compensation expense	$ 398,000	$ 299,000	$ 989,000	$ 931,000