Pension and Other Postretirement Plans (Amounts Recognized in Financial Statements and Other Comprehensive Income) (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Pension Plans [Member]
Amount recognized in the Company's consolidated financial statements
Assets	$ 0	$ 0
Liabilities	(6,722,000)	(6,202,000)
Net amount recognized	(6,722,000)	(6,202,000)
Amount recognized in accumulated other comprehensive income
Net loss	11,283,000	10,680,000
Prior service cost	12,000	15,000
Net amount recognized	11,295,000	10,695,000
Chairman and President Non-Qualified Defined Benefit Plans [Member]
Amount recognized in the Company's consolidated financial statements
Assets	0	0
Liabilities	(22,525,000)	(21,401,000)
Net amount recognized	(22,525,000)	(21,401,000)
Amount recognized in accumulated other comprehensive income
Net loss	11,117,000	10,235,000
Prior service cost	878,000	936,000
Net amount recognized	11,995,000	11,171,000
Defined Benefit Postretirement Healthcare Plans [Member]
Amount recognized in the Company's consolidated financial statements
Assets	0	0
Liabilities	(3,482,000)	(3,471,000)
Net amount recognized	(3,482,000)	(3,471,000)
Amount recognized in accumulated other comprehensive income
Net loss	878,000	1,023,000
Prior service cost	670,000	773,000
Net amount recognized	$ 1,548,000	$ 1,796,000