Employee Benefits Plans (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Compensation and Retirement Disclosure [Abstract]
Maximum employee contribution percent of annual salary	75.00%
Maximum employer matching percent of salary per pay period	100.00%
Maximum employer matching contribution, annual amount	$ 4,500	$ 4,500	$ 4,500
Cost recognized	$ 6,200,000	$ 5,800,000	$ 5,400,000