Retirement Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Contributions to Pension Plans			$ (354)	$ (244)
Employees' Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	367	340	1,101	1,019
Interest Cost	315	468	944	1,406
Expected Return on Plan Assets	(716)	(755)	(2,148)	(2,265)
Amortization of Prior Service Cost (Credit)	10	10	28	30
Amortization of Net Loss	311	309	935	930
Net Periodic Benefit Cost	287	372	860	1,120
Contributions to Pension Plans	0	0	0	0
Estimated Future Contributions in the Current Fiscal Year					0
Select Executive Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	5	19	32	57
Interest Cost	33	51	81	153
Expected Return on Plan Assets	0	0	0	0
Amortization of Prior Service Cost (Credit)	19	11	59	33
Amortization of Net Loss	38	35	114	105
Net Periodic Benefit Cost	95	116	286	348
Contributions to Pension Plans	133	84	354	244
Estimated Future Contributions in the Current Fiscal Year					118
Post-Retirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	51	45	153	135
Interest Cost	56	98	206	279
Expected Return on Plan Assets	0	0	0	0
Amortization of Prior Service Cost (Credit)	(28)	(28)	(86)	(85)
Amortization of Net Loss	41	33	124	99
Net Periodic Benefit Cost	120	148	397	428
Contributions to Pension Plans	77	66	252	297
Estimated Future Contributions in the Current Fiscal Year					$ 84