Retirement Agreements And Other Postretirement Benefits (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Retirement Agreements And Other Postretirement Benefits [Abstract]
Service cost - benefits earned during the year	$ 3,154	$ 6,425	$ 6,308	$ 12,849
Interest cost on the projected benefit obligation	6,967	7,689	13,934	15,378
Amortization of unrecognized prior service cost	2,349	5,097	4,698	10,194
Amortization of unrecognized gains	170	643	340	1,286
Net periodic benefits costs	12,640	19,854	25,280	39,707
Employee benefits and other payments	$ 5,991,000		$ 5,991,000		$ 5,740,000