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Commitments and Contingent Liabilities (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2016 | Mar. 31, 2015
Commitments and Contingent Liabilities |  |  |
Lease period, minimum |  | 5 years |
Lease period, maximum |  | 20 years |
Loss Contingencies |  |  |
Letters of credit outstanding |  | $ 30,500 |
Surety bonds posted |  | 13,200 |
Holdings | Holdings Bond |  |  |
Loss Contingencies |  |  |
Senior unsecured notes issued |  | $ 700,000 |
Senior subordinated convertible notes, interest rate (as a percent) |  | 3.80% |
Penske Truck Leasing Co., L.P. |  |  |
Loss Contingencies |  |  |
Ownership interest in Penske Truck Leasing Co (as a percent) |  | 9.00% | 9.00%
GECC |  |  |
Loss Contingencies |  |  |
Ownership interest in Penske Truck Leasing Co (as a percent) |  | 29.90% | 29.90%
Mitsui and Co |  |  |
Loss Contingencies |  |  |
Ownership interest in Penske Truck Leasing Co (as a percent) |  | 20.00% | 20.00%
Purchase of ownership interest | 20.00% |  |
Penske Corporation |  |  |
Loss Contingencies |  |  |
Ownership interest in Penske Truck Leasing Co (as a percent) |  | 41.10% | 41.10%
Guarantee of Indebtedness of Others | GECC |  |  |
Loss Contingencies |  |  |
Percentage of interest agreed to indemnify if GECC required to make any payments of principal or interest |  | 9.00% |
Annual fee pay for acting as co-obligor |  | $ 950 |
Value of principal repayment included in maximum amount of Company's potential obligations |  | $ 63,100 |

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