Share-based Compensation (Option Price Ranges) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Stock options outstanding	109,499
Stock options outstanding, Weighted Average Remaining Contractual Term (in years)	3 years 3 months 12 days	2 years 3 months 25 days	1 year 10 months 17 days	1 year
Stock options outstanding, Weighted Average Exercise Price (in dollars per share)	$ 30.73	$ 15.17	$ 16.41	$ 8.28
Stock options exercisable	34,874
Stock options exercisable, Weighted Average Exercise Price (in dollars per share)	$ 18.70
$14.89 Exercise Price Range
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares authorized under stock option plans, exercise price range, lower range limit	14.89
Shares authorized under stock option plans, exercise price range, upper range limit	$ 14.89
Stock options outstanding, by exercise price range	28,124
Stock options outstanding, Weighted Average Remaining Contractual Term (in years)	6 months 5 days
Stock options outstanding, Weighted Average Exercise Price, by exercise price range (in dollars per share)	$ 3.82
Stock options exercisable, by exercise price range	16,874
Stock options exercisable, Weighted Average Exercise Price, by exercise price range (in dollars per share)	$ 7.20
$21.19 Exercise Price Range
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares authorized under stock option plans, exercise price range, lower range limit	21.19
Shares authorized under stock option plans, exercise price range, upper range limit	$ 21.19
Stock options outstanding, by exercise price range	33,375
Stock options outstanding, Weighted Average Remaining Contractual Term (in years)	11 months 1 day
Stock options outstanding, Weighted Average Exercise Price, by exercise price range (in dollars per share)	$ 6.46
Stock options exercisable, by exercise price range	15,375
Stock options exercisable, Weighted Average Exercise Price, by exercise price range (in dollars per share)	$ 9.34
$28.59 Exercise Price Range
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares authorized under stock option plans, exercise price range, lower range limit	28.59
Shares authorized under stock option plans, exercise price range, upper range limit	$ 28.59
Stock options outstanding, by exercise price range	6,000
Stock options outstanding, Weighted Average Remaining Contractual Term (in years)	2 months 5 days
Stock options outstanding, Weighted Average Exercise Price, by exercise price range (in dollars per share)	$ 1.57
Stock options exercisable, by exercise price range	2,625
Stock options exercisable, Weighted Average Exercise Price, by exercise price range (in dollars per share)	$ 2.16
$49.22 Exercise Price Range
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares authorized under stock option plans, exercise price range, lower range limit	49.22
Shares authorized under stock option plans, exercise price range, upper range limit	$ 49.22
Stock options outstanding, by exercise price range	42,000
Stock options outstanding, Weighted Average Remaining Contractual Term (in years)	1 year 7 months 28 days
Stock options outstanding, Weighted Average Exercise Price, by exercise price range (in dollars per share)	$ 18.88
Stock options exercisable, by exercise price range	0
Stock options exercisable, Weighted Average Exercise Price, by exercise price range (in dollars per share)	$ 0.00