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Defined Benefit Plan | 6 Months Ended
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Jun. 30, 2017
Compensation and Retirement Disclosure [Abstract] |
Defined Benefit Plan | Defined Benefit Plan We maintain a defined benefit pension plan (the “Benefit Plan”) covering substantially all of our Wyoming Refining employees. Benefits are based on years of service and the employee’s highest average compensation received during five consecutive years of the last 10 years 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. As of June 30, 2017 and December 31, 2016, we had no amounts recorded in Accumulated other comprehensive income that are expected to be amortized into net periodic benefit cost in 2017. The Benefit Plan was assumed in connection with the WRC Acquisition on July 14, 2016. The net periodic benefit cost (credit) related to our defined benefit plan includes the following components (in thousands):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Components of net periodic benefit cost (credit): |  |  |  |  |  |  |
Service cost | $ | 154 |  |  | $ | — |  |  | $ | 307 |  |  | $ | — |
Interest cost | 298 |  |  | — |  |  | 596 |  |  | — |
Expected return on plan assets | (298 | ) |  | — |  |  | (595 | ) |  | — |
Net periodic benefit cost | $ | 154 |  |  | $ | — |  |  | $ | 308 |  |  | $ | — |

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2410-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39675-114964 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66047640&loc=d3e39622-114963 + Details
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