Retirement Agreements And Other Postretirement Benefits (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract]
Service cost - benefits earned during the year	$ 3,945	$ 3,154	$ 7,891	$ 6,308
Interest cost on the projected benefit obligation	7,103	6,967	14,206	13,934
(Accretion) amortization of unrecognized prior service cost	(379)	2,349	(759)	4,698
Amortization of unrecognized losses	1,574	170	3,147	340
Net periodic benefits costs	12,243	12,640	24,485	25,280
Employee benefits and other payments	$ 6,536,000		$ 6,536,000		$ 6,303,000