Stock-Based Compensation (Summary of the Company's Option Activity) (Details)	3 Months Ended
	Mar. 31, 2013
Share-based Compensation Arrangement [Line Items]
Outstanding as of January 1, 2013	5,829,945
Granted	1,338,360
Exercised	(149,926)
Forfeited
Expired
Outstanding as of March 31, 2013	7,018,379