Share-Based Compensation (Details 2) (USD $)	9 Months Ended
	Sep. 30, 2013
Restricted stock activity
Restricted shares outstanding, beginning of period, weighted average price	$ 33.38
Restricted shares outstanding, beginning of period, shares	896,164
Restricted shares granted, weighted average price	$ 15.33
Restricted shares granted, shares	637,430
Restricted shares canceled, weighted average price	$ 26.20
Restricted shares canceled, shares	(56,663)
Restricted shares vested, weighted average price	$ 32.74
Restricted shares vested, shares	(384,239)
Restricted shares outstanding, end of period, weighted average price	$ 23.45
Restricted shares outstanding, end of period, shares	1,092,692