Employee Benefit Plan (Details) (USD $)	12 Months Ended
	Dec. 31, 2014 Officer	Dec. 31, 2013	Dec. 31, 2012
Profit Sharing and 401(k) Plan for eligible employees [Member]
Employee Benefit Plan (Textual)
Defined benefit plan, annually cost	$ 263,000	$ 235,000	$ 195,000
Number of executive officers	16
Supplemental Executive Retirement Plan (nonqualified deferred compensation plan) [Member]
Employee Benefit Plan (Textual)
Defined benefit plan, annually cost	352,000	753,000	497,000
Accrued benefit obligation	$ 2,800,000	$ 2,500,000