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Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2017
Compensation and Retirement Disclosure [Abstract]  
Schedule of Defined Benefit Plans Disclosures
The changes in the projected benefit obligation and the fair value of plan assets of our Benefit Plan for the year ended December 31, 2017 and the period from July 14, 2016 to December 31, 2016 were as follows (in thousands):
 
2017
 
2016
Changes in projected benefit obligation:

 
 
Projected benefit obligation as of the beginning of the period
$
28,914

 
$
34,319

Service cost
614

 
668

Interest cost
1,192

 
598

Plan amendment
—

 
(3,067
)
Actuarial (gain) loss
1,091

 
(2,436
)
Benefits paid
(934
)
 
(1,168
)
Projected benefit obligation as of December 31
$
30,877

 
$
28,914

 
 
 
 
Changes in fair value of plan assets:
 
 
 
Fair value of plan assets as of the beginning of the period
$
21,345

 
$
22,067

Actual return on plan assets
3,050

 
446

Employer contributions
—

 
—

Benefits paid
(934
)
 
(1,168
)
Fair value of plan assets as of December 31
$
23,461

 
$
21,345
Schedule of Accumulated and Projected Benefit Obligations
The reconciliation of the underfunded status of our Benefit Plans of December 31, 2017 and 2016 was as follows:
 
2017
 
2016
Projected benefit obligation
$
30,877

 
$
28,914

Fair value of plan assets
23,461

 
21,345

Underfunded status
$
7,416

 
$
7,569

 
 
 
 
Gross amounts recognized in accumulated other comprehensive income: (1)
 
 
 
Net actuarial gain
$
2,965

 
$
2,196

____________________________________________________
(1)
As of December 31, 2017, we had no amounts recorded in accumulated other comprehensive income that are expected to be amortized into net periodic benefit cost in 2018.
Schedule of Assumptions Used
Weighted-average assumptions used to measure our projected benefit obligation as of December 31, 2017 and 2016 and net periodic benefit costs for the year ended December 31, 2017 and the period from July 14, 2016 to December 31, 2016 are as follows:
 
2017
 
2016
Projected benefit obligation:
 
 
 
Discount rate (1)
3.65
%
 
4.20
%
Rate of compensation increase
3.00
%
 
4.30
%
 
 
 
 
Net periodic benefit costs:
 
 
 
Discount rate (1)
4.20
%
 
3.80
%
Expected long-term rate of return (2)
6.25
%
 
7.00
%
Rate of compensation increase
4.30
%
 
4.03
%
_________________________________________________________
(1)
In determining the discount rate, we use yields on high-quality fixed income investments with payments matched to the estimated distributions of benefits from our plans.
(2)
The expected long-term rate of return is based on a blend of historic returns of equity and debt securities.
Schedule of Net Benefit Costs
The net periodic benefit cost (credit) for the year ended December 31, 2017 and the period from July 14, 2016 to December 31, 2016 includes the following components:
 
2017
 
2016
Components of net periodic benefit cost (credit):
 
 
 
Service cost
$
614

 
$
668

Interest cost
1,192

 
598

Expected return on plan assets
(1,189
)
 
(686
)
Plan amendment effect
—

 
(3,067
)
Net periodic benefit cost (credit)
$
617


$
(2,487
)
Schedule of Allocation of Plan Assets
The weighted-average asset allocation at December 31, 2017 is as follows:
 
Target
 
Actual
Asset category:
 
 
 
Equity securities
60
%
 
59
%
Debt securities
30
%
 
32
%
Real estate
10
%
 
9
%
Total
100
%
 
100
%
Schedule of Expected Benefit Payments
Based on current data and assumptions, the following benefit payments, which reflect expected future service, as appropriate, are expected to be paid over the next 10 years:
Year Ended
 
 
2018
 
$
1,090

2019
 
1,140

2020
 
1,240

2021
 
1,310

2022
 
1,270

Thereafter
 
7,800

 
 
$
13,850
Schedule of Benefit Obligations in Excess of Fair Value of Plan Assets
The changes in the benefit obligation of our post-retirement medical plan as of and for the year ended December 31, 2015 were as follows (in thousands):
 
Year Ended December 31,
 
2015
Benefit obligation at the beginning of year
$
5,414

Service cost
370

Interest cost
212

Plan amendments
—

Plan termination
(6,632
)
Actuarial loss (gain)
636

Projected benefit obligation at end of year
$
—