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Nature of Operations and Significant Accounting Policies - Narrative (Details) mi in Thousands, $ in Millions | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Mar. 31, 2017 USD ($) state employee mi | Jun. 30, 2017 USD ($) | Dec. 30, 2016 USD ($)
Background |  |  |
Total number of rail route miles | mi | 21 |  |
Number of states rail network serves | state | 23 |  |
Allowance for Doubtful Accounts |  |  |
Allowance for doubtful accounts | $ 23 |  | $ 33
Management Streamlining Initiative |  |  |
Other Items [Abstract] |  |  |
Workforce reduction (number of employees) | employee | 765 |  |
Severance and Pension | Scenario, Forecast | Management Streamlining Initiative |  |  |
Other Items [Abstract] |  |  |
Payments for restructuring |  | $ 90 |

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