Stock-Based Compensation (Other Stock Grants) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Excess tax benefits from stock-based compensation	$ 0	$ 1,100,000	$ (100,000)
Other stock grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued	4,000
Recognized stock-based compensation expense	$ 1,000,000
Other stock grants | Interim Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued	43,873