Accumulated Other Comprehensive Income (Loss) (Tables)

3 Months Ended

Mar. 31, 2016

Equity [Abstract]

Changes in Accumulated Other Comprehensive Loss

	Defined Benefit			Commodity
	Pension and			Contracts
	Postretirement			Cash Flow
	Plan Items			Hedges			Total
(in thousands)
As of December 31, 2015	$	(5,580	)	$	(260	)	$	(5,840	)
Other comprehensive loss before reclassifications	—			(283		)	(283		)
Amounts reclassified from accumulated other comprehensive loss	89			283			372
Net current-period other comprehensive income	89			—			89
As of March 31, 2016	$	(5,491	)	$	(260	)	$	(5,751	)

	Defined Benefit			Commodity
	Pension and			Contracts
	Postretirement			Cash Flow
	Plan Items			Hedges			Total
(in thousands)
As of December 31, 2014	$	(5,643	)	$	(33	)	$	(5,676	)
Other comprehensive loss before reclassifications	—			(7		)	(7		)
Amounts reclassified from accumulated other comprehensive loss	82			33			115
Net prior-period other comprehensive income	82			26			108
As of March 31, 2015	$	(5,561	)	$	(7	)	$	(5,568	)

Reclassifications out of Accumulated Other Comprehensive Income (Loss)

	Three Months Ended
	March 31,
	2016			2015
(in thousands)
Amortization of defined benefit pension and postretirement plan items:
Prior service cost (1)	$	20		$	17
Net loss (1)	(168		)	(154		)
Total before income taxes	(148		)	(137		)
Income tax benefit	59			55
Net of tax	$	(89	)	$	(82	)
Gains and losses on commodity contracts cash flow hedges
Propane swap agreements (2)	$	(322	)	$	—
Call options (2)	—			(55		)
Natural gas futures (2)	(149		)	—
Total before income taxes	(471		)	(55		)
Income tax benefit	188			22
Net of tax	(283		)	(33		)
Total reclassifications for the period	$	(372	)	$	(115	)