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Related Party Transactions - Transactions (Details) $ in Thousands |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 07, 2017 USD ($) | Sep. 06, 2017 | Dec. 31, 2017 USD ($) | Sep. 30, 2017 | Sep. 30, 2016 USD ($) item | Jul. 31, 2016 | Jun. 30, 2016 | Dec. 31, 2018 USD ($) individual | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
PTL |  |  |  |  |  |  |  |  |  |
Related party transactions |  |  |  |  |  |  |  |  |  |
Ownership interest in Penske Truck Leasing Co (as a percent) |  | 23.40% |  |  |  | 23.40% | 9.00% | 28.90% |  |
Ownership acquired (as a percent) | 5.50% |  |  | 5.50% |  | 14.40% |  |  |  |
Penske Corporation | PTL |  |  |  |  |  |  |  |  |  |
Related party transactions |  |  |  |  |  |  |  |  |  |
Ownership interest in Penske Truck Leasing Co (as a percent) |  |  |  |  |  |  |  | 41.10% |  |
Mitsui and Co | PTL |  |  |  |  |  |  |  |  |  |
Related party transactions |  |  |  |  |  |  |  |  |  |
Ownership interest in Penske Truck Leasing Co (as a percent) |  |  |  |  |  |  |  | 30.00% |  |
Ownership acquired (as a percent) | 10.00% |  |  |  |  |  |  |  |  |
Penske Vehicle Services |  |  |  |  |  |  |  |  |  |
Related party transactions |  |  |  |  |  |  |  |  |  |
Ownership interest sold (as a percent) |  |  | 31.00% |  |  |  |  |  |  |
Sale of ownership interest to PTL | Penske Vehicle Services |  |  |  |  |  |  |  |  |  |
Related party transactions |  |  |  |  |  |  |  |  |  |
Ownership interest sold (as a percent) |  |  | 31.00% |  |  |  |  |  |  |
Purchase price |  |  | $ 19,200 |  |  |  |  |  |  |
Penske Corporation and its affiliates |  |  |  |  |  |  |  |  |  |
Related party transactions |  |  |  |  |  |  |  |  |  |
Provider's cost reimbursed |  |  |  |  |  |  |  | $ 6,200 | $ 6,200 | $ 6,900
Amount of Provider's cost received |  |  |  |  |  |  |  | 183 | 159 | 148
Amount due from related party |  |  | 58 |  |  |  |  | 100 | 58 |
Amount due to related party |  |  | $ 700 |  |  |  |  | $ 600 | 700 |
PTL |  |  |  |  |  |  |  |  |  |
Related party transactions |  |  |  |  |  |  |  |  |  |
Number of members on the advisory committee | individual |  |  |  |  |  |  |  | 6 |  |
Previous number of members on the advisory committee | individual |  |  |  |  |  |  |  | 7 |  |
Number of members on the advisory committee the Company is entitled to | individual |  |  |  |  |  |  |  | 1 |  |
Pro rata quarterly distribution rate (as a percent) |  |  |  |  |  |  |  | 50.00% |  |
Partnership interest that my be transferred without complying with the right of first offer (as a percent) |  |  |  |  |  |  |  | 9.02% |  |
Pro rata cash dividends received |  |  |  |  |  |  |  | $ 63,200 | $ 52,400 | $ 21,700
Cost of acquisition | $ 239,100 |  |  |  |  |  |  |  |  |
PTL | Sale of certain assets to PTL |  |  |  |  |  |  |  |  |  |
Related party transactions |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  | $ 17,000 |  |  |  |  |
PTG | Sale of certain assets to PTL |  |  |  |  |  |  |  |  |  |
Related party transactions |  |  |  |  |  |  |  |  |  |
Number of vehicles sold | item |  |  |  |  | 300 |  |  |  |  |

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