Accumulated Other Comprehensive Income (Loss) (Tables)

6 Months Ended

Jun. 30, 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 gain before reclassifications	—			525			525
Amounts reclassified from accumulated other comprehensive loss	176			(29		)	147
Net current-period other comprehensive income	176			496			672
As of June 30, 2016	$	(5,404	)	$	236		$	(5,168	)

	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	—			(1		)	(1		)
Amounts reclassified from accumulated other comprehensive loss	165			33			198
Net prior-period other comprehensive income	165			32			197
As of June 30, 2015	$	(5,478	)	$	(1	)	$	(5,479	)

Reclassifications out of Accumulated Other Comprehensive Income (Loss)

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2016			2015			2016			2015
(in thousands)
Amortization of defined benefit pension and postretirement plan items:
Prior service cost (1)	$	20		$	17		$	40		$	34
Net loss (1)	(166		)	(155		)	(333		)	(310		)
Total before income taxes	(146		)	(138		)	(293		)	(276		)
Income tax benefit	58			55			117			111
Net of tax	$	(88	)	$	(83	)	$	(176	)	$	(165	)
Gains and losses on commodity contracts cash flow hedges
Propane swap agreements (2)	$	—		$	(10	)	$	(322	)	$	2
Call options (2)	—			—			—			(55		)
Natural gas futures (2)	211			—			359			—
Total before income taxes	211			(10		)	37			(53		)
Income tax benefit (expense)	(81		)	4			(8		)	21
Net of tax	130			(6		)	29			(32		)
Total reclassifications for the period	$	42		$	(89	)	$	(147	)	$	(197	)