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Benefit Plans
 12 Months Ended
Dec. 31, 2020
Retirement Benefits [Abstract]  
Benefit Plans Benefit Plans
Defined Contribution Plans
    We maintain defined contribution plans for our employees. All eligible employees, including our U.S. Oil & Refining Co. employees beginning January 1, 2020, may participate in our Par plan after thirty days of service. For all employees participating in the Par plan, excluding participating U.S. Oil union employees, we match employee contributions up to a maximum of 6% of the employee’s eligible compensation, with the employer contributions vesting at 100%. Beginning in January 2021 and as part of cost reductions in response to the impact of the COVID-19 pandemic on our businesses, we have temporarily suspended matching employee contributions for salaried employees with 2020 annual earnings in excess of the IRS highly compensated limit of $130,000. For the years ended December 31, 2020, 2019, and 2018, we made contributions to the plans totaling approximately $5.6 million, $5.6 million, and $4.0 million, respectively.
Defined Benefit Plans
    We maintain defined benefit pension plans (the “Benefit Plans”) covering eligible Wyoming Refining employees and the employees of U.S. Oil covered by a collective bargaining agreement. Benefits under our Wyoming Refining plan are based on years of service and the employee’s highest average compensation received during five consecutive years of the last ten
years of employment. Benefits under our U.S. Oil plan are based on the employee’s hourly rate of compensation at the beginning of each year of employment. Our funding policy is to contribute annually an amount equal to the pension expense, subject to the minimum funding requirements of the Employee Retirement Income Security Act of 1974 and the tax deductibility of such contributions. In December 2016 and March 2021, the Wyoming Refining plan was amended to freeze all future benefit accruals for salaried and hourly plan participants, respectively.
    The changes in the projected benefit obligation and the fair value of plan assets of our Benefit Plans for the years ended December 31, 2020 and 2019 were as follows (in thousands):
20202019
Changes in projected benefit obligation:
Projected benefit obligation as of the beginning of the period$52,142 $27,539 
Acquired
— 16,831 
Service cost
1,347 910 
Interest cost
1,642 1,794 
Actuarial loss (1)7,038 6,688 
Benefits paid
(1,690)(1,620)
Projected benefit obligation as of the end of the period$60,479 $52,142 
Changes in fair value of plan assets:
Fair value of plan assets as of the beginning of the period$42,866 $20,254 
Acquired
— 16,027 
Actual return (loss) on plan assets
4,860 6,405 
Employer contributions
125 1,800 
Benefits paid
(1,690)(1,620)
Fair value of plan assets as of the end of the period$46,161 $42,866 
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(1)For the year ended December 31, 2020, the change in the actuarial loss was due to a decrease in the discount rate, new entrants to the plan, and salary changes, partially offset by demographic assumption changes. For the year ended December 31, 2019, the change in the actuarial loss was due to a decrease in the discount rate, partially offset by differences between actual activity and actuarial assumptions and demographic assumption changes.
The underfunded status of our Benefit Plans is recorded within Other liabilities on our consolidated balance sheets. The reconciliation of the underfunded status of our Benefit Plans of December 31, 2020 and 2019 was as follows:
20202019
Projected benefit obligation$60,479 $52,142 
Fair value of plan assets46,161 42,866 
Underfunded status$14,318 $9,276 
Gross amounts recognized in accumulated other comprehensive income (loss): (1)
Net actuarial gain (loss)$(6,946)$(2,622)
____________________________________________________
(1)As of December 31, 2020, we had no service costs recognized in accumulated other comprehensive income.
    Weighted-average assumptions used to measure our projected benefit obligation as of December 31, 2020, 2019, and 2018 and net periodic benefit costs for the years ended December 31, 2020, 2019 and 2018 are as follows:
202020192018
Projected benefit obligation:
Wyoming Refining plan
Discount rate (1)2.65 %3.30 %4.20 %
Rate of compensation increase3.00 %3.00 %3.00 %
U.S. Oil plan
Discount rate (1)2.35 %3.10 %— %
Rate of compensation increase3.00 %3.00 %— %
Net periodic benefit costs:
Wyoming Refining plan
Discount rate (1)3.30 %4.20 %3.65 %
Expected long-term rate of return (2)6.25 %6.50 %6.50 %
Rate of compensation increase3.00 %3.00 %3.00 %
U.S. Oil plan
Discount rate (1)3.10 %4.10 %— %
Expected long-term rate of return (2)6.00 %6.00 %— %
Rate of compensation increase3.00 %3.00 %— %
_________________________________________________________
(1)In determining the discount rate, we use pricing and yield information for high-quality corporate bonds that result in payments similar to the estimated distributions of benefits from our plans.
(2)The expected long-term rate of return is based on the target asset allocation of each plan and capital market assumptions developed using forward-looking models and historical market data and trends.
    The net periodic benefit cost for the years ended December 31, 2020, 2019, and 2018 includes the following components:
202020192018
Components of net periodic benefit cost:
Service cost$1,347 $910 $548 
Interest cost1,642 1,794 1,107 
Expected return on plan assets(2,323)(1,972)(1,258)
Amortization of net loss176 95 — 
Amortization of prior service cost1 3 — 
Net periodic benefit cost$843 $830 $397 
    The Service cost component of net periodic benefit cost is included in Operating expense (excluding depreciation) on our consolidated statement of operations for the years ended December 31, 2020, 2019, and 2018. The other components of net periodic benefit cost are included in Other income, net on our consolidated statement of operations for the years ended December 31, 2020, 2019, and 2018.
    The weighted-average asset allocation for our Wyoming Refining plan at December 31, 2020 is as follows:
TargetActual
Asset category:
Equity securities54 %54 %
Debt securities35 %35 %
Real estate11 %11 %
Total100 %100 %
    The weighted-average asset allocation for our U.S. Oil plan at December 31, 2020 is as follows:
TargetActual
Asset category:
Equity securities56 %59 %
Debt securities43 %41 %
Cash and Cash Equivalents1 %— %
Total100 %100 %
    We have a long-term, risk-controlled investment approach using diversified investment options with minimal exposure to volatile investment options like derivatives. Our Benefit Plans’ assets are invested in pooled separate accounts administered by the Benefit Plans’ custodians. The underlying assets in the pooled separate accounts are invested in equity securities, debt securities, real estate, or cash and cash equivalents. The pooled separate accounts are valued based upon the fair market value of the underlying investments and are deemed to be Level 2.
    We intend to contribute $0.2 million to the Wyoming Refining plan during 2021. We do not intend to make any contributions to the U.S. Oil plan during 2021. 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
2021$2,012 
20222,098 
20232,229 
20242,260 
20252,468 
Thereafter13,806 
$24,873