Pension and Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2017

Compensation And Retirement Disclosure [Abstract]

Schedule of Changes in Projected Benefit Obligations

The following tables set forth the plans’ changes in benefit obligations, plan assets and funded status on the measurement dates, December 31, 2017, 2016 and 2015, and amounts recognized in our Consolidated Balance Sheets within other long-term liabilities as of those dates.

	Pension Benefits									Other Benefits
(Table only in thousands)	2017			2016			2015			2017			2016			2015
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	$	35,012		$	36,140		$	38,208			n/a			n/a			n/a
Accumulated postretirement benefit obligation		n/a			n/a			n/a			131		$	159		$	155
Service cost		415			447			233			—			—			—
Interest cost		1,314			1,426			1,412			4			4			5
Amendments		—			—			—			—			—			9
Actuarial loss/(gain)		1,787			301			(1,744	)		3			(8	)		18
Administrative expenses		(402	)		(606	)		(214	)		—			—			—
Benefits paid		(1,799	)		(2,696	)		(1,755	)		(26	)		(24	)		(28	)
Projected benefit obligation at end of year		36,327			35,012			36,140			112			131			159
Change in plan assets:
Fair value of plan assets at beginning of year		24,063			25,296			27,302			—			—			—
Actual return (loss) on plan assets		3,152			2,040			(443	)		—			—			—
Employer contribution		1,822			29			406			26			24			28
Administrative expenses		(402	)		(606	)		(214	)		—			—			—
Benefits paid		(1,799	)		(2,696	)		(1,755	)		(26	)		(24	)		(28	)
Fair value of plan assets at end of year		26,836			24,063			25,296			—			—			—
Unfunded status	$	(9,491	)	$	(10,949	)	$	(10,844	)	$	(112	)	$	(131	)	$	(159	)
Defined benefit liabilities included in accounts    payable and accrued expenses	$	—		$	—		$	—		$	(24	)	$	(25	)	$	(26	)
Defined benefit liabilities included in other    liabilities		(9,491	)		(10,949	)		(10,844	)		(88	)		(106	)		(133	)
Deferred tax benefit associated with accumulated other comprehensive loss		3,153			3,107			3,154			12			15			15
Accumulated other comprehensive loss, net of tax		5,154			5,074			5,144			7			9			27
Net amount recognized	$	(1,184	)	$	(2,768	)	$	(2,546	)	$	(93	)	$	(107	)	$	(117	)
Other comprehensive income (loss):
Net loss (gain)	$	358		$	90		$	708		$	3		$	(9	)	$	17
Prior service cost		—			—			—			—			—			9
Amortization of prior service cost		—			—			—			(11	)		(10	)		(9	)
Amortization of net actuarial (gain)/loss		(227	)		(212	)		(258	)		3			1			3
Total recognized in other comprehensive income (loss)	$	131		$	(122	)	$	450		$	(5	)	$	(18	)	$	20
Accumulated other comprehensive income:
Net loss (gain)	$	8,307		$	8,181		$	8,298		$	(22	)	$	(28	)	$	(20	)
Prior service cost		—			—			—			41			52			62
Amount recognized in accumulated other    comprehensive income	$	8,307		$	8,181		$	8,298		$	19		$	24		$	42
Weighted-average assumptions used to determine    benefit obligations for the year ended    December 31:
Discount rate		3.35	%		3.85	%		4.00	%		2.65	%		2.75	%		3.00	%
Compensation increase rate		n/a			n/a			n/a			n/a			n/a			n/a

Weighted-average Assumptions Used to Determine Net Periodic Benefit Cost

The details of net periodic benefit cost for pension benefits included in the accompanying Consolidated Statements of Operations for the years ended December 31, 2017, 2016 and 2015 are as follows:

(Table only in thousands)	2017			2016			2015
Service cost	$	415		$	447		$	233
Interest cost		1,314			1,426			1,412
Expected return on plan assets		(1,723	)		(1,829	)		(2,009	)
Net amortization and deferral		227			212			258
Net periodic benefit cost (income)	$	233		$	256		$	(106	)
Weighted-average assumptions used to determine net    periodic benefit costs for the years ended December 31:
Discount rate		3.85	%		4.00	%		3.75	%
Expected return on assets		7.25	%		7.50	%		7.50	%
Compensation increase rate		n/a			n/a			n/a

Details of Defined Benefit Pension Plan Asset Allocation by Asset Category

Our defined benefit pension plan asset allocation by asset category is as follows:

	Target Allocation			Percentage of Plan Assets
	2017			2017			2016
Asset Category:
Cash and cash equivalents		0	%		4	%		4	%
Equity securities		70	%		70	%		67	%
Debt securities		30	%		26	%		29	%
Total		100	%		100	%		100	%

Disclosure of Fair Value Measurements of Pension Plan Assets

The levels assigned to the defined benefit plan assets as of December 31, 2017, are summarized in the tables below:

(Table only in thousands)	Level 1		Level 2		Level 3		Total
Pension assets, at fair value:
Cash and cash equivalents	$	1,147	$	—	$	—	$	1,147
Equity securities		18,723		—		—		18,723
Debt securities		6,967		—		—		6,967
Total assets	$	26,836	$	—	$	—	$	26,836

The levels assigned to the defined benefit plan assets as of December 31, 2016, are summarized in the tables below:

(Table only in thousands)	Level 1		Level 2		Level 3		Total
Pension assets, at fair value:
Cash and cash equivalents	$	894	$	—	$	—	$	894
Equity securities		16,153		—		—		16,153
Debt securities		7,016		—		—		7,016
Total assets	$	24,063	$	—	$	—	$	24,063

Summary of Pension Fund General Information

Pension Fund	EIN/Pension Plan Number	Pension Protection Act Zone Status	FIP/RP Status Pending/ Implemented	Surcharge Imposed	Expiration of Collective Bargaining Agreement
Sheet Metal Workers’ National Pension Fund	52-6112463/001	Yellow	FIP: Yes - Implemented RP: Yes - Implemented	No	various
Sheet Metal Workers Local 224 Pension Plan	31-6171353/001	Yellow	FIP: Yes - Implemented	No	May 31, 2018
Sheet Metal Workers Local No. 20, Indianapolis Area Pension fund	51-0168516/001	Green	Is not subject	No	May 31, 2020
Sheet Metal Workers Local No. 177 Pension Fund	62-6093256/001	Green	Is not subject	No	May 1, 2018