Share-based Compensation (Option Price Ranges) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Stock options outstanding	792,000
Stock options outstanding, Weighted Average Remaining Contractual Term (in years)	1 year	1 year 2 months 1 day	1 year 6 months 21 days	2 years 6 months 3 days
Stock options outstanding, Weighted Average Exercise Price (in dollars per share)	$ 8.28	$ 4.03	$ 2.51	$ 2.22
Stock options exercisable	679,500
Stock options exercisable, Weighted Average Exercise Price (in dollars per share)	$ 6.78
$1.75-$2.36 Exercise Price Range [Member]
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	$ 1.75
Shares authorized under stock option plans, exercise price range, upper range limit	$ 2.36
Stock options outstanding, by exercise price range	477,000
Stock options outstanding, Weighted Average Remaining Contractual Term (in years)	4 months 12 days
Stock options outstanding, Weighted Average Exercise Price, by exercise price range (in dollars per share)	$ 1.78
Stock options exercisable, by exercise price range	477,000
Stock options exercisable, Weighted Average Exercise Price, by exercise price range (in dollars per share)	$ 1.78
$14.89-$17.58 Exercise Price Range [Member] [Member]
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	$ 17.58
Stock options outstanding, by exercise price range	225,000
Stock options outstanding, Weighted Average Remaining Contractual Term (in years)	1 year 11 months 13 days
Stock options outstanding, Weighted Average Exercise Price, by exercise price range (in dollars per share)	$ 16.91
Stock options exercisable, by exercise price range	146,250
Stock options exercisable, Weighted Average Exercise Price, by exercise price range (in dollars per share)	$ 17.53
$20.58-$21.70 Exercise Price Range [Member] [Member]
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)	1 year 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	56,250
Stock options exercisable, Weighted Average Exercise Price, by exercise price range (in dollars per share)	$ 21.25