Stock Plans and Stock Based Compensation (Stock Options by Range of Exercise Prices) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 year
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number Outstanding (in shares)	6,081,263
Options Outstanding, Weighted Average Remaining Contractual Life (In years)	3.67
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 38.25
Options Outstanding, Aggregate Intrinsic Value	$ 3,003
Options Exercisable (in shares)	3,593,374
Options Exercisable, Weighted Average Remaining Contractual Life (In years)	2.65
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 40.58
Options Exercisable, Aggregate Intrinsic Value	1,319
Closing stock price	$ 27.33
In-the-money, options exercisable	431,077
$0.00 - $10.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, min (in dollars per share)	$ 0.00
Range of Exercise Price, max (in dollars per share)	$ 10.00
Number Outstanding (in shares)	657
Options Outstanding, Weighted Average Remaining Contractual Life (In years)	0.16
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 0.24
Options Outstanding, Aggregate Intrinsic Value	18
Options Exercisable (in shares)	657
Options Exercisable, Weighted Average Remaining Contractual Life (In years)	0.16
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 0.24
Options Exercisable, Aggregate Intrinsic Value	18
$10.01 - $20.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, min (in dollars per share)	$ 10.01
Range of Exercise Price, max (in dollars per share)	$ 20.00
Number Outstanding (in shares)	29,264
Options Outstanding, Weighted Average Remaining Contractual Life (In years)	0.55
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 13.35
Options Outstanding, Aggregate Intrinsic Value	409
Options Exercisable (in shares)	29,264
Options Exercisable, Weighted Average Remaining Contractual Life (In years)	0.55
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 13.35
Options Exercisable, Aggregate Intrinsic Value	409
$20.01 - $30.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, min (in dollars per share)	$ 20.01
Range of Exercise Price, max (in dollars per share)	$ 30.00
Number Outstanding (in shares)	1,167,411
Options Outstanding, Weighted Average Remaining Contractual Life (In years)	4.11
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 25.20
Options Outstanding, Aggregate Intrinsic Value	2,576
Options Exercisable (in shares)	468,256
Options Exercisable, Weighted Average Remaining Contractual Life (In years)	4.02
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 25.61
Options Exercisable, Aggregate Intrinsic Value	892
$30.01 - $40.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, min (in dollars per share)	$ 30.01
Range of Exercise Price, max (in dollars per share)	$ 40.00
Number Outstanding (in shares)	2,916,283
Options Outstanding, Weighted Average Remaining Contractual Life (In years)	4.11
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 36.33
Options Outstanding, Aggregate Intrinsic Value	0
Options Exercisable (in shares)	1,318,068
Options Exercisable, Weighted Average Remaining Contractual Life (In years)	2.24
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 35.19
Options Exercisable, Aggregate Intrinsic Value	0
$40.01 - $50.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, min (in dollars per share)	$ 40.01
Range of Exercise Price, max (in dollars per share)	$ 50.00
Number Outstanding (in shares)	1,415,972
Options Outstanding, Weighted Average Remaining Contractual Life (In years)	2.69
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 45.65
Options Outstanding, Aggregate Intrinsic Value	0
Options Exercisable (in shares)	1,340,657
Options Exercisable, Weighted Average Remaining Contractual Life (In years)	2.49
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 45.95
Options Exercisable, Aggregate Intrinsic Value	0
$50.01 - $60.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, min (in dollars per share)	$ 50.01
Range of Exercise Price, max (in dollars per share)	$ 60.00
Number Outstanding (in shares)	503,356
Options Outstanding, Weighted Average Remaining Contractual Life (In years)	3.08
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 57.96
Options Outstanding, Aggregate Intrinsic Value	0
Options Exercisable (in shares)	389,108
Options Exercisable, Weighted Average Remaining Contractual Life (In years)	3.05
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 57.78
Options Exercisable, Aggregate Intrinsic Value	0
$60.01 - $70.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, min (in dollars per share)	$ 60.01
Range of Exercise Price, max (in dollars per share)	$ 70.00
Number Outstanding (in shares)	48,320
Options Outstanding, Weighted Average Remaining Contractual Life (In years)	3.30
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 62.56
Options Outstanding, Aggregate Intrinsic Value	0
Options Exercisable (in shares)	47,364
Options Exercisable, Weighted Average Remaining Contractual Life (In years)	3.29
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 62.52
Options Exercisable, Aggregate Intrinsic Value	$ 0