Retirement Agreements And Other Postretirement Benefits (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the year	$ 4,187	$ 3,667	$ 8,374	$ 7,334
Interest cost on the projected benefit obligation	7,693	7,618	15,386	15,236
(Accretion) amortization of unrecognized prior service cost	1,098	555	2,195	1,109
Amortization of unrecognized losses	878	0	1,757	0
Net periodic benefits costs	13,856	$ 11,840	27,712	$ 23,679
Employee benefits and other payments	$ 7,662,000		$ 7,662,000		$ 7,111,000