Retirement Agreements And Other Postretirement Benefits (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Retirement Agreements And Other Postretirement Benefits [Abstract]
Service cost - benefits earned during the year	$ 3,155	$ 1,778	$ 9,463	$ 14,627
Interest cost on the projected benefit obligation	6,966	3,077	20,900	18,455
Amortization of unrecognized prior service cost	2,349	(415)	7,047	9,779
Amortization of unrecognized losses (gains)	171	(1,525)	511	(239)
Net periodic benefits costs	12,641	2,915	37,921	42,622
Employee benefits and other payments	$ 6,163,000		$ 6,163,000		$ 5,740,000