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Exit and Termination Costs (Tables) | 6 Months Ended
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Jun. 30, 2021
Restructuring And Related Activities [Abstract] |
Summary of Exit and Termination Costs | The following summarizes our exit and termination costs for the three and six months ended June 30, 2021 and 2020 (in thousands):
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Severance costs |  | $ | — |  |  | $ | (148 | ) |  | $ | 509 |  |  | $ | 1,447 |
Transportation contract capacity releases (including accretion of discount) |  |  | 184 |  |  |  | 10,445 |  |  |  | 394 |  |  |  | 10,445 |
Divestiture contract obligation (including accretion of discount) |  |  | (16,130 | ) |  |  | — |  |  |  | (3,135 | ) |  |  | — |
|  | $ | (15,946 | ) |  | $ | 10,297 |  |  | $ | (2,232 | ) |  | $ | 11,892 |
Exit and Termination Costs Included in Accrued Liabilities in Consolidated Balance Sheet | The following details the accrued exit and termination cost liability activity for the six months ended June 30, 2021 (in thousands):
|  | Exit Costs (1) |  |  | Termination Costs |
Balance at December 31, 2020 |  | $ | 493,543 |  |  | $ | 1,454 |
Accrued severance costs |  |  | — |  |  |  | 509 |
Accretion of discount |  |  | 25,424 |  |  |  | — |
Divestiture contract obligation - changes in estimate |  |  | (28,165 | ) |  |  | — |
Payments |  |  | (46,321 | ) |  |  | (1,594 | )
Balance at June 30, 2021 |  | $ | 444,481 |  |  | $ | 369 |
(1) Includes the divestiture contract obligation and the transportation contract capacity release obligation.

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- Definition Tabular disclosure of costs incurred for restructuring including, but not limited to, exit and disposal activities, remediation, implementation, integration, asset impairment, and charges against earnings from the write-down of assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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- Definition Tabular disclosure of an entity's restructuring reserve that occurred during the period associated with the exit from or disposal of business activities or restructurings for each major type of cost. This element may also include a description of any reversal and other adjustment made during the period to the amount of an accrued liability for restructuring activities. This element may be used to encapsulate the roll forward presentations of an entity's restructuring reserve by type of cost and in total, and explanation of changes that occurred in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)(2)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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