Comprehensive Income (Loss) (Accumulated Other Comprehensive Loss, Net of Tax) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2013
Pension Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning	$ (532)	$ (411)
Amounts reclassified from accumulated other comprehensive loss	7	5
Net current-period other comprehensive income (loss)	7	5
Balance, ending	(525)	(406)
Postretirement Costs [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning	(119)		(5)
Amounts reclassified from accumulated other comprehensive loss	2
Net current-period other comprehensive income (loss)	2
Balance, ending	(117)	(5)	(5)
Deferred Taxes On Pension And OPEB Costs [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning	247	156
Other comprehensive income before reclassifications	(2)
Amounts reclassified from accumulated other comprehensive loss	(4)	(2)
Net current-period other comprehensive income (loss)	(6)	(2)
Balance, ending	241	154
All Other [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning	(404)	(260)
Other comprehensive income before reclassifications	(2)
Amounts reclassified from accumulated other comprehensive loss	5	3
Net current-period other comprehensive income (loss)	3	3
Balance, ending	$ (401)	$ (257)