Accumulated Other Comprehensive Income (Loss) (Tables)

9 Months Ended

Sep. 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	—			641			641
Amounts reclassified from accumulated other comprehensive loss	263			(93		)	170
Net current-period other comprehensive income	263			548			811
As of September 30, 2016	$	(5,317	)	$	288		$	(5,029	)

	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	—			(76		)	(76		)
Amounts reclassified from accumulated other comprehensive loss	248			33			281
Net prior-period other comprehensive income	248			(43		)	205
As of September 30, 2015	$	(5,395	)	$	(76	)	$	(5,471	)

Reclassifications out of Accumulated Other Comprehensive Income (Loss)

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2016			2015			2016			2015
(in thousands)
Amortization of defined benefit pension and postretirement plan items:
Prior service cost (1)	$	20		$	17		$	60		$	50
Net loss (1)	(166		)	(155		)	(500		)	(465		)
Total before income taxes	(146		)	(138		)	(440		)	(415		)
Income tax benefit	58			55			177			167
Net of tax	$	(88	)	$	(83	)	$	(263	)	$	(248	)
Gains and losses on commodity contracts cash flow hedges
Propane swap agreements (2)	$	—		$	—		$	(322	)	$	—
Call options (2)	—			—			—			(55		)
Natural gas futures (2)	105			—			464			—
Total before income taxes	105			—			142			(55		)
Income tax benefit (expense)	(41		)	—			(49		)	22
Net of tax	64			—			93			(33		)
Total reclassifications for the period	$	(24	)	$	(83	)	$	(170	)	$	(281	)