Pension and Other Postretirement Plans (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 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	$ 84,000	$ 95,000
Interest cost	239,000	218,000	479,000	436,000
Expected return on plan assets	(319,000)	(283,000)	(639,000)	(567,000)
Amortization of prior service cost	1,000	1,000	2,000	2,000
Amortization of net loss	106,000	203,000	211,000	406,000
Net periodic benefit cost	69,000	186,000	137,000	372,000
Minimum required contribution	694,150		694,150
Contributions payable, from prior plan years		100,000		100,000
Company contributions to plan			300,000
Chairman and President Non-Qualified Defined Benefit Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	74,000	45,000	147,000	89,000
Interest cost	251,000	200,000	502,000	400,000
Amortization of prior service cost	14,000	14,000	29,000	29,000
Amortization of net loss	324,000	293,000	647,000	587,000
Net periodic benefit cost	663,000	552,000	1,325,000	1,105,000
Company expected contributions to plans in fiscal year			2,000,000
Company contributions to plan			900,000
Defined Benefit Postretirement Healthcare Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Interest cost	27,000	30,000	55,000	59,000
Amortization of prior service cost	26,000	25,000	52,000	51,000
Amortization of net loss	(1,000)	8,000	(2,000)	16,000
Net periodic benefit cost	$ 52,000	$ 63,000	$ 105,000	$ 126,000
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%