Stock Compensation - Performance Share Grants with Performance Conditions (Details) (Performance Shares)	3 Months Ended
	Mar. 31, 2013
Performance Share Grants with Performance Conditions [Abstract]
Below threshold performance	0
Minimum
Performance Share Grants with Performance Conditions [Abstract]
Threshold and Targe performance	93,550
Maximum [Member]
Performance Share Grants with Performance Conditions [Abstract]
Threshold and Targe performance	558,582
Maximum performance	821,814