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Related Parties (Narrative) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) stores | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Related Parties |  |  |
Number of stores | 5,219 |  |
Related parties [Member] |  |  |
Related Parties |  |  |
Number of stores | 74 |  |
Lease payments under related party operating leases | $ | $ 4.6 | $ 4.6 | $ 4.5

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- Definition Amount of transactions with related party during the financial reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864 + Details
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