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Fair value measurement (Tables) | 12 Months Ended
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Dec. 31, 2019
Fair Value Disclosures [Abstract] |
Fair Value of Pension Plan Assets by Level within Fair Value Hierarchy | The below fair value tables relate to our TRP pension plan assets (in thousands):
Pension Plan Assets
Fair value measurement as of Dec. 31, 2019
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets: |  |  |  |  |  |  |
Cash and other | $ | 1,395 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,395 |
Corporate stock | 111,193 |  |  | — |  |  | — |  |  | 111,193 |
Interest in registered investment companies | 48,221 |  |  | — |  |  | — |  |  | 48,221 |
Total | $ | 160,809 |  |  | $ | — |  |  | $ | — |  |  | $ | 160,809 |
Pension plan investments valued using net asset value as a practical expedient: |  |
Common collective trust - equities |  | $ | 111,385 |
Common collective trust - fixed income |  | 185,844 |
Hedge funds |  | 17,125 |
Partnership/joint venture interests |  | 4,572 |
Total fair value of plan assets |  | $ | 479,735 |
Fair value measurement as of Dec. 31, 2018
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets: |  |  |  |  |  |  |
Cash and other | $ | 958 |  |  | $ | — |  |  | $ | — |  |  | $ | 958 |
Corporate stock | 83,489 |  |  | — |  |  | — |  |  | 83,489 |
Interest in registered investment companies | 39,007 |  |  | — |  |  | — |  |  | 39,007 |
Total | $ | 123,454 |  |  | $ | — |  |  | $ | — |  |  | $ | 123,454 |
Pension plan investments valued using net asset value as a practical expedient: |  |
Common collective trust - equities |  | $ | 104,993 |
Common collective trust - fixed income |  | 158,580 |
Hedge funds |  | 16,126 |
Partnership/joint venture interests |  | 4,397 |
Total fair value of plan assets |  | $ | 407,550 |

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