Share-based Compensation (Option Price Ranges) (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]
Stock options outstanding	207,000
Stock options outstanding, Weighted Average Remaining Contractual Term (in years)	1 year 10 months 17 days	1 year	1 year 2 months 1 day	1 year 6 months 21 days
Stock options outstanding, Weighted Average Exercise Price (in dollars per share)	$ 16.41	$ 8.28	$ 4.03	$ 2.51
Stock options exercisable	139,500
Stock options exercisable, Weighted Average Exercise Price (in dollars per share)	$ 16.35
$2.18-$2.36 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	$ 2.18
Shares authorized under stock option plans, exercise price range, upper range limit	$ 2.36
Stock options outstanding, by exercise price range	27,000
Stock options outstanding, Weighted Average Remaining Contractual Term (in years)	1 year 4 months 27 days
Stock options outstanding, Weighted Average Exercise Price, by exercise price range (in dollars per share)	$ 2.27
Stock options exercisable, by exercise price range	27,000
Stock options exercisable, Weighted Average Exercise Price, by exercise price range (in dollars per share)	$ 2.27
$14.89-$16.94 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	$ 16.94
Stock options outstanding, by exercise price range	90,000
Stock options outstanding, Weighted Average Remaining Contractual Term (in years)	2 years 11 months 23 days
Stock options outstanding, Weighted Average Exercise Price, by exercise price range (in dollars per share)	$ 15.92
Stock options exercisable, by exercise price range	33,750
Stock options exercisable, Weighted Average Exercise Price, by exercise price range (in dollars per share)	$ 16.26
$20.58-$21.70 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	$ 20.58
Shares authorized under stock option plans, exercise price range, upper range limit	$ 21.70
Stock options outstanding, by exercise price range	90,000
Stock options outstanding, Weighted Average Remaining Contractual Term (in years)	0 years 11 months 6 days
Stock options outstanding, Weighted Average Exercise Price, by exercise price range (in dollars per share)	$ 21.14
Stock options exercisable, by exercise price range	78,750
Stock options exercisable, Weighted Average Exercise Price, by exercise price range (in dollars per share)	$ 21.22