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Commitments and Contingent Liabilities (Details) - USD ($) $ in Thousands |  |  |  |  | 1 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | ---
Oct. 02, 2017 | Sep. 30, 2017 | Jul. 27, 2016 | Jul. 26, 2016 | Mar. 31, 2015 | Sep. 30, 2017
Commitments and Contingent Liabilities |  |  |  |  |  |
Lease period, minimum |  |  |  |  |  | 5 years
Lease period, maximum |  |  |  |  |  | 20 years
Loss Contingencies |  |  |  |  |  |
Letters of credit outstanding |  | $ 33,000 |  |  |  | $ 33,000
Surety bonds posted |  | 26,100 |  |  |  | 26,100
Holdings | Holdings Bond |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |
Senior unsecured notes issued |  | $ 700,000 |  |  |  | $ 700,000
Senior subordinated convertible notes, interest rate (as a percent) |  | 3.80% |  |  |  | 3.80%
Percentage of interest and principal due to the co-obligor as a result of the change in ownership and subsequent relief of debt obligation |  |  |  |  | 50.10% |
Percentage of expenses relating to the debt obligation due to the co-obligor as a result of the change in ownership and subsequent relief of debt obligation |  |  |  |  | 100.00% |
PTL |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |
Ownership interest in Penske Truck Leasing Co (as a percent) |  | 28.90% | 23.40% | 9.00% |  |
Mitsui and Co |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |
Purchase of ownership interest |  |  |  |  | 20.00% |
Mitsui and Co | PTL |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |
Ownership interest in Penske Truck Leasing Co (as a percent) |  | 30.00% |  |  |  |
Penske Corporation | PTL |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |
Ownership interest in Penske Truck Leasing Co (as a percent) |  | 41.10% |  |  |  |
Guarantee of Indebtedness of Others | GEC |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |
Percentage of interest agreed to indemnify if GEC required to make any payments of principal or interest |  | 9.00% |  |  |  | 9.00%
Annual fee pay for acting as co-obligor |  | $ 950 |  |  |  | $ 950
Amount of prepayment of obligation related to guarantee of indebtedness | $ 63,800 |  |  |  |  |

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