Annual report pursuant to Section 13 and 15(d)

Employee Benefits (Details)

v2.4.0.8
Employee Benefits (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Compensation and Retirement Disclosure [Abstract]      
Employer matching contribution percent 100.00%    
Employer matching percent 6.00%    
Employer contributions $ 4,524,062 $ 3,604,741 $ 2,859,197