Retirement Agreements And Other Postretirement Benefits (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the year	$ 0	$ 2,545
Interest cost on the projected benefit obligation	9,217	8,781
Amortization of unrecognized prior service cost	0	0
Amortization of unrecognized losses	2,153	2,235
Net periodic benefits costs	11,370	$ 13,561
Employee benefits and other payments	$ 9,468,000		$ 8,487,000