Stock-Based Compensation Plans (Details) (USD $)	12 Months Ended					10 Months Ended	12 Months Ended					1 Months Ended	12 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Employee Stock Option Plan	Dec. 31, 2004 Employee Stock Option Plan	Dec. 31, 2002 Non-Employee Director Stock Option Plan	Dec. 31, 2012 Non-Employee Director Stock Option Plan	Dec. 31, 2013 Restricted Stock Plan [Member]	Dec. 31, 2012 Restricted Stock Plan [Member]	Dec. 31, 2011 Restricted Stock Plan [Member]	Dec. 31, 2010 Restricted Stock Plan [Member]	May 31, 2013 Employee Stock Purchase Plan [Member]	Dec. 31, 2013 Employee Stock Purchase Plan [Member]	Dec. 31, 2003 Employee Stock Purchase Plan [Member]	Dec. 31, 2013 Employee Stock Purchase Plan, 2003 [Member]	Dec. 31, 2012 Employee Stock Purchase Plan, 2003 [Member]	Dec. 31, 2011 Employee Stock Purchase Plan, 2003 [Member]	Dec. 31, 2013 Employee Stock Purchase Plan, 2013 [Member]	Dec. 31, 2012 Employee Stock Purchase Plan, 2013 [Member]	Dec. 31, 2011 Employee Stock Purchase Plan, 2013 [Member]	Dec. 31, 2013 Minimum Employee Stock Option Plan	Dec. 31, 2013 Minimum Restricted Stock Plan [Member]	Dec. 31, 2012 Minimum Restricted Stock Plan [Member]	Dec. 31, 2011 Minimum Restricted Stock Plan [Member]	Dec. 31, 2013 Maximum Employee Stock Option Plan	Dec. 31, 2013 Maximum Restricted Stock Plan [Member]	Dec. 31, 2012 Maximum Restricted Stock Plan [Member]	Dec. 31, 2011 Maximum Restricted Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options available for grant					18,000,000
Options granted net of shares from canceled/expired options				15,723,739		549,240	84,000
Option vesting period							6 months														1 year				5 years
Share Based Compensation Arrangement By Share Based Payment Award, Award Expiration Period																					3 years				7 years
Unrecognized compensation cost				$ 24,527,192
Weighted-average period for unrecognized compensation cost expected to be recognized				2 years 2 months 6 days
Shares approved							500,000				2,000,000			1,000,000
Option expiration period, years							10 years
ESPP discount rate													85.00%
Discount recognized as compensation expense												15.00%
Shares sold to employees during period	77,632	102,498	68,630												26,170	102,498	68,630	51,462	0	0
Cumulative shares sold to employees during period															1,200,000			51,462
Weighted average fair value of shares sold															$ 17.01			$ 22.64
Restricted period, maximum, in years								10 years
Shares granted with restriction period	187,090	225,730	140,900					768,200
Restricted period for granted shares, in years								5 years
Market price																						$ 20.23	$ 17.27	$ 24.96		$ 32.83	$ 24.45	$ 30.25
Unearned stock-based compensation								9,762,379
Amortization expense								$ 2,760,446	$ 2,108,583	$ 2,039,377