Stock-Based Compensation (Exercise Price Range) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding, number of options (in share)	85,901	111,571	139,446	144,370
Options outstanding, weighted-average exercise price (in dollars per share)	$ 34.85	$ 38.92	$ 53.66	$ 68.90
Options outstanding, weighted-average remaining contractual life (years)	5 years 8 months 2 days
Exercisable options, number of options (in shares)	67,407	73,665	50,997
Exercisable options, weighted-average exercise price (in dollars per share)	$ 42.80
Under $50.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, upper limit (in dollars per share)	$ 50.00
Options outstanding, number of options (in share)	68,931
Options outstanding, weighted-average exercise price (in dollars per share)	$ 5.84
Options outstanding, weighted-average remaining contractual life (years)	6 years 5 months 21 days
Exercisable options, number of options (in shares)	50,437
Exercisable options, weighted-average exercise price (in dollars per share)	$ 5.81
$80.01 - $120.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise rice range, lower limit (in dollars per share)	$ 80.01
Exercise price range, upper limit (in dollars per share)	$ 120.00
Options outstanding, number of options (in share)	10,011
Options outstanding, weighted-average exercise price (in dollars per share)	$ 101.30
Options outstanding, weighted-average remaining contractual life (years)	3 years 2 months 1 day
Exercisable options, number of options (in shares)	10,011
Exercisable options, weighted-average exercise price (in dollars per share)	$ 101.30
$120.01 - $160.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise rice range, lower limit (in dollars per share)	$ 120.01
Exercise price range, upper limit (in dollars per share)	$ 160.00
Options outstanding, number of options (in share)	1,691
Options outstanding, weighted-average exercise price (in dollars per share)	$ 151.20
Options outstanding, weighted-average remaining contractual life (years)	0 years 0 months 2 days
Exercisable options, number of options (in shares)	1,691
Exercisable options, weighted-average exercise price (in dollars per share)	$ 151.20
$160.01 - $220.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise rice range, lower limit (in dollars per share)	$ 160.01
Exercise price range, upper limit (in dollars per share)	$ 220.00
Options outstanding, number of options (in share)	1,714
Options outstanding, weighted-average exercise price (in dollars per share)	$ 207.61
Options outstanding, weighted-average remaining contractual life (years)	1 year 0 months 28 days
Exercisable options, number of options (in shares)	1,714
Exercisable options, weighted-average exercise price (in dollars per share)	$ 207.61
$220.01 - $279.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise rice range, lower limit (in dollars per share)	$ 220.01
Exercise price range, upper limit (in dollars per share)	$ 279.00
Options outstanding, number of options (in share)	3,554
Options outstanding, weighted-average exercise price (in dollars per share)	$ 272.01
Options outstanding, weighted-average remaining contractual life (years)	2 years 1 month 4 days
Exercisable options, number of options (in shares)	3,554
Exercisable options, weighted-average exercise price (in dollars per share)	$ 272.01