Stock Compensation - Restricted Stock and Performance Share Grants - Performance Share Grants (Details)	12 Months Ended
	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	35 months
Performance share grants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Below threshold performance	0
Performance share grants [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Threshhold and target performance	97,000
Performance share grants [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Threshhold and target performance	615,881
Maximum performance	907,767