Benefit Plans - Additional Information (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2007	Jan. 01, 2001
Defined Benefit Plan Disclosure [Line Items]
401(k) Plan, treasury shares authorized to be purchased					80,000
401(k) Plan, shares purchased out of Treasury	0	0	0
401(k) Plan, employer matching contribution, percent of match				50.00%
401(k) Plan, employer matching contribution, percent of employee's wage				6.00%
401(k) Plan, maximum annual contributions per employee, percent	3.00%
401(k) Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
401(k) Plan, employer matching contributions	$ 467	$ 410	$ 395