Pension and Other Postretirement Plans (Narrative) (Details)	12 Months Ended
	Dec. 31, 2015 USD ($) benefit_plan	Dec. 31, 2014 USD ($)	Dec. 31, 2007
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 25,500,000	$ 23,300,000
Amortization of net loss	(23,000)
Amortization of prior service cost	$ 103,000
Average rate of return	5.80%
Average rate of return, inception to date	6.96%
Number of non-qualified defined benefit pension plan | benefit_plan	3
Chairman and President Non-Qualified Defined Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 19,500,000	$ 17,700,000
Amortization of net loss	1,286,000
Amortization of prior service cost	59,000
Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Vesting percentage in accrued benefits from plan freeze			100.00%
Amortization of net loss	$ (746,200)