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Related Party Transactions - Transactions (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) individual | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
PTL |  |  |
Related party transactions |  |  |
Ownership interest in Penske Truck Leasing Co (as a percent) | 28.90% |  |
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% |  |
Penske Corporation and its affiliates |  |  |
Related party transactions |  |  |
Provider's cost reimbursed | $ 4,100 | $ 5,400 | $ 6,200
Amount of Provider's cost received | 30 | 80 | 183
Amount due from related party | 20 | 46 |
Amount due to related party | $ 400 | 600 |
PTL |  |  |
Related party transactions |  |  |
Number of members on the advisory committee | individual | 6 |  |
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 | $ 72,200 | $ 71,900 | $ 63,200

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