Pension Plan Components Of Net Periodic Benefit Costs (Details) (Supplemental Employee Retirement Plans, Defined Benefit [Member], USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Supplemental Employee Retirement Plans, Defined Benefit [Member]
Components of net periodic benefit cost:
Interest cost	$ 526,000	$ 541,000
Amortization of actuarial loss	(128,000)	0
Subtotal	654,000	541,000
Settlement loss, net	(2,162,000)	0
Net periodic benefit cost	$ 2,816,000	$ 541,000
Weighted average assumption:
Discount rate	4.50%	5.50%