Retirement Agreements And Other Postretirement Benefits (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Retirement Agreements And Other Postretirement Benefits [Abstract]
Service cost - benefits earned during the year	$ 3,946	$ 3,154
Interest cost on the projected benefit obligation	7,103	6,967
(Accretion) amortization of unrecognized prior service cost	(380)	2,349
Amortization of unrecognized losses	1,573	170
Net periodic benefits costs	12,242	12,640
Employee benefits and other payments	$ 6,447,000		$ 6,303,000