Retirement Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				12 Months Ended	3 Months Ended		12 Months Ended	3 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Employees' Pension Plan [Member]	Mar. 31, 2013 Employees' Pension Plan [Member]	Dec. 31, 2014 Employees' Pension Plan [Member] Scenario, Forecast [Member]	Mar. 31, 2014 Select Executive Retirement Plan [Member]	Mar. 31, 2013 Select Executive Retirement Plan [Member]	Dec. 31, 2014 Select Executive Retirement Plan [Member] Scenario, Forecast [Member]	Mar. 31, 2014 Post-Retirement Benefit Plans [Member]	Mar. 31, 2013 Post-Retirement Benefit Plans [Member]	Dec. 31, 2014 Post-Retirement Benefit Plans [Member] Scenario, Forecast [Member]
Net Periodic Benefit Cost [Line Items]
Service Cost			$ 377	$ 367		$ 0	$ 22		$ 53	$ 51
Interest Cost			330	353		61	38		110	81
Expected Return on Plan Assets			(722)	(716)		0	0		0	0
Amortization of Prior Service (Credit) Cost			(11)	9		18	20		(29)	(29)
Amortization of Net Loss			86	312		23	38		7	41
Net Periodic Benefit Cost			60	325		102	118		141	144
Contributions to Retirement Benefits Plans	(261)	(191)	0	0		119	111		142	81
Estimated Future Contributions in the Current Fiscal Year					$ 0			$ 357			$ 426