Benefit Plans (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Compensation and Retirement Disclosure [Abstract]
Contribution to 401(k) plan	$ 284,865	$ 267,289	$ 226,377
Percentage eligible pay for dollar by dollar fixed match (in hundredths)	1.00%
Employer contribution for each dollar contributed by employee after 1% of eligible pay	0.5
Maximum percentage of employee gross pay employer can contribute under 401(k) plan (in hundredths)	5.00%
Employee contribution limit for employees under 50 years of age	17,500	17,000	16,500
Employee contribution limit for employees of 50 years of age or older	$ 23,000	$ 22,500	$ 22,000