Pension and Other Postretirement Plans (Amounts Recognized in Financial Statements and Other Comprehensive Income) (Details) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Pension Plans [Member]
Amount recognized in the Company's consolidated financial statements
Assets	$ 0	$ 0
Liabilities	(7,355,000)	(3,682,000)
Net amount recognized	(7,355,000)	(3,682,000)
Amount recognized in accumulated other comprehensive income
Net loss	11,039,000	8,017,000
Prior service cost	0	3,000
Net amount recognized	11,039,000	8,020,000
Chairman and President Non-Qualified Defined Benefit Plans [Member]
Amount recognized in the Company's consolidated financial statements
Assets	0	0
Liabilities	(22,735,000)	(24,145,000)
Net amount recognized	(22,735,000)	(24,145,000)
Amount recognized in accumulated other comprehensive income
Net loss	9,885,000	11,959,000
Prior service cost	700,000	759,000
Net amount recognized	10,585,000	12,718,000
Defined Benefit Postretirement Healthcare Plans [Member]
Amount recognized in the Company's consolidated financial statements
Assets	0	0
Liabilities	(3,307,000)	(2,890,000)
Net amount recognized	(3,307,000)	(2,890,000)
Amount recognized in accumulated other comprehensive income
Net loss	480,000	128,000
Prior service cost	361,000	464,000
Net amount recognized	$ 841,000	$ 592,000