Stock-based Compensation Stock Based Compensation Phantom (Details) (USD $)	12 Months Ended
	Dec. 31, 2011 Share-based Compensation, Shares Authorized under Stock Options Plans, by Exercise Price Range, Range 1 [Member]	Dec. 31, 2012 Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Range 2 [Member]	Dec. 31, 2012 Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Range 3 [Member]	Dec. 31, 2012 Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Range 4 [Member]	Dec. 31, 2012 Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Range 5 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$ 4.42	$ 0	$ 0	$ 0	$ 4.42
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$ 12.50	$ 0	$ 0	$ 0	$ 12.50