Income Taxes (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Income Taxes [Abstract]
Effective tax rate (in hundredths)	(5.70%)	(60.00%)	(7.70%)	(3.50%)