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Employee Retirement Plans - Asset Allocation (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Pension plan |  |
Employee retirement plans |  |
Actual allocation of pension plan assets | $ 38,053 |
Qualified Hourly Pension Plan [Member] |  |
Employee retirement plans |  |
Target (as a percent) | 100.00% |
Actual allocation of pension plan assets |  | $ 7,495
Weighted-average asset allocation (as a percent) |  | 100.00%
Qualified Hourly Pension Plan [Member] | Large Cap Equity |  |
Employee retirement plans |  |
Target (as a percent) | 5.00% |
Weighted-average asset allocation (as a percent) | 0.00% |
Qualified Hourly Pension Plan [Member] | Mid Cap Equity |  |
Employee retirement plans |  |
Target (as a percent) | 0.00% |
Weighted-average asset allocation (as a percent) | 0.00% |
Qualified Hourly Pension Plan [Member] | Small Cap Equity |  |
Employee retirement plans |  |
Target (as a percent) | 0.00% |
Weighted-average asset allocation (as a percent) | 0.00% |
Qualified Hourly Pension Plan [Member] | International Equity |  |
Employee retirement plans |  |
Target (as a percent) | 2.00% |
Weighted-average asset allocation (as a percent) | 0.00% |
Qualified Hourly Pension Plan [Member] | Emerging markets Equity |  |
Employee retirement plans |  |
Target (as a percent) | 0.00% |
Weighted-average asset allocation (as a percent) | 0.00% |
Qualified Hourly Pension Plan [Member] | Fixed Income and Cash Equivalents |  |
Employee retirement plans |  |
Target (as a percent) | 90.00% |
Actual allocation of pension plan assets | $ 7,388 |
Weighted-average asset allocation (as a percent) | 99.00% |
Qualified Hourly Pension Plan [Member] | Real Estate |  |
Employee retirement plans |  |
Target (as a percent) | 3.00% |
Actual allocation of pension plan assets | $ 107 |
Weighted-average asset allocation (as a percent) | 1.00% |
Salaried Pension Plan |  |
Employee retirement plans |  |
Target (as a percent) |  | 100.00%
Actual allocation of pension plan assets |  | $ 30,558
Weighted-average asset allocation (as a percent) |  | 100.00%
Salaried Pension Plan | Large Cap Equity |  |
Employee retirement plans |  |
Target (as a percent) | 5.00% |
Weighted-average asset allocation (as a percent) | 0.00% |
Salaried Pension Plan | Mid Cap Equity |  |
Employee retirement plans |  |
Target (as a percent) | 0.00% |
Weighted-average asset allocation (as a percent) | 0.00% |
Salaried Pension Plan | Small Cap Equity |  |
Employee retirement plans |  |
Target (as a percent) | 0.00% |
Weighted-average asset allocation (as a percent) | 0.00% |
Salaried Pension Plan | International Equity |  |
Employee retirement plans |  |
Target (as a percent) | 2.00% |
Weighted-average asset allocation (as a percent) | 0.00% |
Salaried Pension Plan | Emerging markets Equity |  |
Employee retirement plans |  |
Target (as a percent) | 0.00% |
Weighted-average asset allocation (as a percent) | 0.00% |
Salaried Pension Plan | Fixed Income and Cash Equivalents |  |
Employee retirement plans |  |
Target (as a percent) | 90.00% |
Actual allocation of pension plan assets | $ 30,009 |
Weighted-average asset allocation (as a percent) | 98.00% |
Salaried Pension Plan | Real Estate |  |
Employee retirement plans |  |
Target (as a percent) | 3.00% |
Actual allocation of pension plan assets | $ 549 |
Weighted-average asset allocation (as a percent) | 2.00% |

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