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Operating Lease Agreements (Narrative) (Details) $ in Thousands |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 22, 2017 USD ($) | Mar. 31, 2010 USD ($) | Dec. 31, 2017 USD ($) location | Dec. 31, 2016 USD ($)
Operating Leased Assets [Line Items] |  |  |  |
Number of locations the Company as lessee | location |  |  | 2,743 |
Lease term of aircraft operating lease agreement |  | 8 years |  |
Periodic payments for aircraft operating lease agreement |  | $ 690 |  |
Fixed amount of early purchase option |  | 26,685 |  |
Cash deposit as collateral for obligations assumed under the agreement |  | $ 5,325 | $ 2,500 | $ 5,325
Aircraft operating lease renewal term | 10 years |  |  |
Periodic payments for aircraft renewal operating lease agreement | $ 442 |  |  |
Collateral deposit for aircraft operating lease | $ 2,500 |  |  |
Minimum [Member] |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Lease term for most restaurants |  |  | 10 years |
Maximum [Member] |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Lease term for most restaurants |  |  | 20 years |

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