Accumulated Other Comprehensive Loss (Tables)

9 Months Ended

Sep. 30, 2018

Equity [Abstract]

Summary of Changes in Accumulated Other Comprehensive Loss by Component

Changes in accumulated other comprehensive loss by component for the nine months ended September 30, 2018 and 2017 consisted of the following (in thousands):

			Other-Than-
	Minimum		Temporary
	Pension		Impairment of
	Liability		Investment		Total
Balance, December 31, 2017	$	(20,149)	$	(6,543)	$	(26,692)
Amounts reclassified from accumulated other comprehensive loss		4,429		249		4,678
Income tax expense		(1,077)		—		(1,077)
Net other comprehensive income		3,352		249		3,601
Balance, September 30, 2018	$	(16,797)	$	(6,294)	$	(23,091)

			Other-Than-
	Minimum		Temporary
	Pension		Impairment of
	Liability		Investment		Total
Balance, December 31, 2016	$	(22,268)	$	—	$	(22,268)
Amounts reclassified from accumulated other comprehensive loss		1,609		—		1,609
Income tax benefit		—		—		—
Net other comprehensive income		1,609		—		1,609
Balance, September 30, 2017	$	(20,659)	$	—	$	(20,659)