Accumulated Other Comprehensive Income (Details) (USD $)	3 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ 4,724,000		$ 4,872,000	$ 3,099,000	$ 3,187,000
Amounts reclassified from accumulated other comprehensive income, before tax	(214,000)	(122,000)
Other Comprehensive Income (Loss), Tax	66,000	34,000
Derivative [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(24,000)		(30,000)	(38,000)	(54,000)
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion	10,000	25,000
Other Comprehensive Income (Loss), Tax	(4,000)	(9,000)
Other Postretirement Benefit Plans, Defined Benefit [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax	4,748,000		4,902,000	3,137,000	3,241,000
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, before Tax	(224,000)	(147,000)
Other Comprehensive Income (Loss), Tax	$ 70,000	$ 43,000