Pension and Other Postretirement Plans (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2007
Defined Benefit Pension Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Vesting percentage in accrued benefits from plan freeze			100.00%
Service cost	$ 42,000	$ 47,000
Interest cost	240,000	218,000
Expected return on plan assets	(320,000)	(283,000)
Amortization of prior service cost	1,000	1,000
Amortization of net loss	105,000	203,000
Net periodic benefit cost	68,000	186,000
Minimum required contribution	0
Contributions payable, from prior plan years		200,000
Company contributions to plan	100,000
Chairman and President Non-Qualified Defined Benefit Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	73,000	44,000
Interest cost	251,000	200,000
Amortization of prior service cost	15,000	15,000
Amortization of net loss	323,000	294,000
Net periodic benefit cost	662,000	553,000
Company expected contributions to plans in fiscal year	2,000,000
Company contributions to plan	400,000
Defined Benefit Postretirement Healthcare Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Interest cost	28,000	29,000
Amortization of prior service cost	26,000	26,000
Amortization of net loss	(1,000)	8,000
Net periodic benefit cost	$ 53,000	$ 63,000
Minimum [Member] | Chairman and President Non-Qualified Defined Benefit Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Aggregate average annual participant salary increase (as a percentage)	10.00%