Share-Based Compensation (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012 number	Sep. 30, 2011	Sep. 30, 2012 number	Sep. 30, 2011
Share based compensation expense [Line Items]
Total share-based compensation expense	$ 3,595,000	$ 3,643,000	$ 10,679,000	$ 10,110,000
Cash proceeds received from stock option excercises			1,000,000
Stock Option Expense	1,000,000	1,000,000	4,000,000	3,000,000
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	2,000,000	2,000,000	7,000,000	7,000,000
Share Based Compensation Arrangment Roll Forward [Abstract]
Outstanding Beginning Shares			3,587
Granted Shares			401
Exercised Shares			(273)
Forfeited or Expired Shares			0
Outstanding Ending Shares	3,715		3,715
Shares Exercisable	2,711		2,711
Outstanding Beginning Weighted Average Exercise Price			$ 16.69
Granted Weighted Average Exercise Price	$ 19.31		$ 19.31
Exercisable Weighted Average Exercise Price	$ 4.81		$ 4.81
Forfeited or Expired Weighted Average Exercise Price			$ 0
Outstanding Ending Weighted Average Exercise Price	$ 17.84		$ 17.84
Exercisable Weighted Average Exercise Price	$ 16.47		$ 16.47
Outstanding Beginning Weighted Average Exercise Term			5
Outstanding Ending Weighted Average Exercise Term	5		5
Exercisable Weighted Average Exercise Term			4
Outstanding Beginning Intrinsic Value			22,299,000
Exercised Intrinsic Value			4,249,000
Outstanding Ending Intrinsic Value	9,115,000		9,115,000
Exercisable Intrinsic Value	8,887,000		8,887,000
Stock Options [Member]
Unrecognized compensation expense [Line Items]
Unrecognized share-based compensation expense	11,000,000		11,000,000
Unrecognized share-based compensaion expense - years			3
Restricted Stock [Member]
Unrecognized compensation expense [Line Items]
Unrecognized share-based compensation expense	22,000,000		22,000,000
Unrecognized share-based compensaion expense - years			3
Cost of Sales [Member]
Share based compensation expense [Line Items]
Total share-based compensation expense	126,000	112,000	331,000	287,000
Selling and Adminstrative Expense [Member]
Share based compensation expense [Line Items]
Total share-based compensation expense	3,170,000	3,259,000	9,417,000	9,088,000
Research and Development Expense [Member]
Share based compensation expense [Line Items]
Total share-based compensation expense	$ 299,000	$ 272,000	$ 931,000	$ 735,000