Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2017

Retirement Benefits [Abstract]

Schedule of Changes in Projected Benefit Obligations

Funded Status at End of Year:
Net accrued benefit cost	($30,609	)	($30,638	)	($1,420	)	($1,285	)

The following tables set forth the change in the projected benefit obligation and plan assets and reconcile the funded status and the amounts recognized in the Consolidated Balance Sheets for the pension and postretirement benefit plans for the two years ended December 31:

	Pension						Postretirement
	2017			2016			2017			2016
Change in Projected Benefit Obligation
Projected benefit obligation at beginning of year		$81,752			$84,005			$1,285			$1,159
Service cost	—			1,307			6			4
Interest cost	3,259			3,474			53			42
Curtailment gain	—			(5,447		)	—			—
Actuarial loss	6,123			1,296			89			99
Benefits paid	(3,148		)	(2,883		)	(13		)	(19		)
Projected benefit obligation at end of year		$87,986			$81,752			$1,420			$1,285

Schedule of Changes in Fair Value of Plan Assets

Change in Plan Assets
Fair value of plan assets at beginning of year		$51,114			$50,970		—		—
Actual return on plan assets	9,909			3,557			—		—
Employer contributions	90			29			13		19
Benefits paid	(3,148		)	(2,883		)	(13	)	(19	)
Other expense	(588		)	(559		)	—		—
Fair value of plan assets at end of year		$57,377			$51,114		—		—

Schedule of Amounts Recognized in Balance Sheet

Amounts Recognized in the Consolidated
Balance Sheets Consist of:
Current liabilities		($92	)		($36	)		($32	)		($30	)
Noncurrent liabilities	(30,517		)	(30,602		)	(1,388		)	(1,255		)
Net amount recognized		($30,609	)		($30,638	)		($1,420	)		($1,285	)

Schedule of Amounts Recognized in Other Comprehensive Income (Loss)

Net gains or losses recognized in other comprehensive income for the three years ended December 31 are as follows:

	Pension								Postretirement
	2017			2016		2015			2017			2016			2015
Net (losses) gains		($583	)		$3,119		($477	)		($89	)		($99	)		$123

Net gains or losses and prior service costs or credits reclassified from other comprehensive income and recognized as a component of pension and postretirement expense for the three years ended December 31 are as follows:

	Pension						Postretirement
	2017		2016		2015		2017			2016			2015
Amortization of losses (gains)		$466		$2,526		$3,733		($1	)		($13	)		$12
Amortization of prior service cost	—		—		13		—			—			—

Schedule of Net Periodic Benefit Cost Not yet Recognized

Net losses that have not yet been included in pension and postretirement expense for the two years ended December 31, which have been recognized as a component of AOCI are as follows:

	Pension						Postretirement
	2017			2016			2017			2016
Net (losses) gains		($22,183	)		($22,065	)		($157	)		($67	)
Deferred income tax benefit	1,927			1,927			6			6
AOCI		($20,256	)		($20,138	)		($151	)		($61	)

Schedule of Projected Benefit Obligation and Accumulated Benefit Obligation in Excess of Fair Value

For pension and postretirement plans with accumulated benefit obligations in excess of plan assets, the following table sets forth the projected and accumulated benefit obligations and the fair value of plan assets for the two years ended December 31:

	2017		2016
Projected benefit obligation		$87,986		$81,752
Accumulated benefit obligation	87,986		81,752
Fair value of plan assets	57,377		51,114

Schedule of Net Benefit Costs

The following tables set forth the components of net pension and postretirement benefit (credit) cost that have been recognized during the three years ended December 31:

	Pension									Postretirement
	2017			2016			2015			2017			2016			2015
Components of Net Periodic Benefit (Credit) Cost
Service cost	—				$1,307			$1,484			$6			$4			$11
Interest cost	3,259			3,474			3,319			53			42			52
Expected return on plan assets	(3,781		)	(4,030		)	(4,027		)	—			—			—
Amortization of prior service cost	—			—			13			—			—			—
Amortization of losses (gains)	466			2,526			3,733			(1		)	(13		)	12
Net periodic benefit (credit) cost (a)		($56	)		$3,277			$4,522			$58			$33			$75

Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year

The estimated pre-tax amounts that will be amortized from AOCI into net periodic benefit cost in 2018 are as follows:

	Pension		Postretirement
Amortization of loss		$635		$2

Schedule of Assumptions Used

The following table sets forth the principal assumptions inherent in the determination of benefit obligations and net periodic benefit cost of the pension and postretirement benefit plans as of December 31:

	Pension						Postretirement
	2017		2016		2015		2017		2016		2015
Assumptions used to determine benefit obligations at December 31:
Discount rate	3.48	%	4.01	%	4.20	%	3.56	%	4.12	%	4.34	%
Rate of compensation increase	—		4.16	%	4.50	%	4.50	%	4.50	%	4.50	%
Assumptions used to determine net periodic benefit cost for years ended December 31:
Discount rate	4.01	%	4.20	%	3.80	%	4.12	%	4.34	%	3.96	%
Expected long-term return on plan assets	7.17	%	7.70	%	7.70	%	—		—		—
Rate of compensation increase	—		4.16	%	4.50	%	4.50	%	4.50	%	4.50	%

Schedule of Allocation of Plan Assets

The Company’s pension plans’ asset allocation (excluding short-term investments) at December 31, 2017 and 2016, and target allocation ranges by asset category are as follows:

	Percentage of  Plan Assets				Target Allocation Range
Asset Category	2017		2016
Domestic equity securities	41	%	41	%	35-45%
International equity securities	26	%	25	%	20-30%
Domestic fixed income securities	26	%	26	%	25-29%
International fixed income securities	4	%	5	%	3-7%
Real estate fund	3	%	3	%	2-4%
Total	100	%	100	%

The following table sets forth by level, within the fair value hierarchy (see Note 2 — Summary of Significant Accounting Policiesfor definition), the assets of the plans as of December 31, 2017 and 2016.

	Fair Value at December 31, 2017						Fair Value at December 31, 2016
Asset Category	Level 1		Level 2	Level 3	Total		Level 1		Level 2	Level 3	Total
Investments at Fair Value:
Mutual Funds		$8,986	—	—		$8,986		$13,962	—	—		$13,962
Investments at Net Asset Value:
Common Collective Trusts					48,391						37,152
Total Investments at Fair Value						$57,377						$51,114

Schedule of Expected Benefit Payments

Expected benefit payments for the next 10 years are as follows:

	Pension Benefits		Postretirement Benefits
2018		$3,315		$32
2019	3,478		35
2020	3,670		37
2021	3,770		40
2022	4,028		43
2023 - 2027	21,803		260