Stockholders' Equity (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2013
Restricted stock activity
Restricted shares outstanding, beginning of period	$ 33.38
Restricted shares outstanding, beginning of period, shares	896,164
Restricted shares granted, fair value	$ 14.86
Restricted shares granted, shares	869,430
Restricted shares canceled	$ 25.79
Restricted shares canceled, shares	(106,903)
Restricted shares vested	$ 32.65
Restricted shares vested, shares	(391,581)
Restricted shares outstanding, end of period	$ 21.54
Restricted shares outstanding, end of period, shares	1,267,110