Stock-based Compensation (Exercise Price Range) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding, number of options (in share)	3,375,909	85,901	111,571	139,446
Options outstanding, weighted-average exercise price (in dollars per share)	$ 5.44	$ 34.85	$ 38.92	$ 53.66
Options outstanding, weighted-average remaining contractual life (years)	8 years 11 months 29 days
Exercisable options, number of options (in shares)	75,909	67,407	73,665
Exercisable options, weighted-average exercise price (in dollars per share)	$ 33.77
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)	3,361,624
Options outstanding, weighted-average exercise price (in dollars per share)	$ 4.81
Options outstanding, weighted-average remaining contractual life (years)	9 years 9 days
Exercisable options, number of options (in shares)	61,624
Exercisable options, weighted-average exercise price (in dollars per share)	$ 5.75
$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)	9,201
Options outstanding, weighted-average exercise price (in dollars per share)	$ 101.30
Options outstanding, weighted-average remaining contractual life (years)	2 years 2 months 3 days
Exercisable options, number of options (in shares)	9,201
Exercisable options, weighted-average exercise price (in dollars per share)	$ 101.30
$120.01 to $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
$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)	1,634
Options outstanding, weighted-average exercise price (in dollars per share)	$ 207.30
Options outstanding, weighted-average remaining contractual life (years)	23 days
Exercisable options, number of options (in shares)	1,634
Exercisable options, weighted-average exercise price (in dollars per share)	$ 207.20
$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)	3,450
Options outstanding, weighted-average exercise price (in dollars per share)	$ 271.98
Options outstanding, weighted-average remaining contractual life (years)	1 year 1 month 4 days
Exercisable options, number of options (in shares)	3,450
Exercisable options, weighted-average exercise price (in dollars per share)	$ 271.98
Restricted Stock | Minimum
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Grants scheduled vesting period	3 years
Restricted Stock | Maximum
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Grants scheduled vesting period	5 years
Employee Stock Option
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercisable options, weighted-average exercise price (in dollars per share)	$ 4.79
Dividend yield	0.00%
Expected volatility	36.59%
Risk-free rate	1.28%
Expected option life	5 years