Share-Based Compensation Expense (Schedule of Options Oustanding)(Details) (USD $) In Thousands, except Per Share data, unless otherwise specified			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 $0.00 - $9.99 [Member]	Dec. 31, 2012 $10.00-$14.99 [Member]	Dec. 31, 2012 $15.00-$19.99 [Member]	Dec. 31, 2012 $20.00 and above [Member]
Number of Shares, Outstanding Options	864	1,035	108	619	128	9
Weighted Average Exercise Price, Outstanding Options	$ 13.08	$ 11.97	$ 9.54	$ 12.40	$ 18.81	$ 20.56
Remaining Contractual Term			4 years 3 months 18 days	3 years 3 months 18 days	6 months	1 year 2 months 12 days