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Summary of Significant Accounting Policies (Narrative) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) store state segment | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Summary of Significant Accounting Policies |  |  |
Number of reportable segments | segment | 1 |  |
Accounts receivable due from employees to the Company | $ 900 | $ 1,100 |
Allowance for doubtful supplier receivables | 0 | 0 |
Replacement cost of inventory | 3,470,000 | 3,200,000 |
LIFO inventory value in excess of replacement cost of inventory | 31,000 | 107,300 |
Goodwill impairment | 0 | 0 |
Impairment of long-lived assets | 1,900 | 11,400 |
Self-insurance reserves, current | 79,079 | 77,012 |
Advertising expense, net | 79,300 | 81,400 | $ 83,700
Total interest costs capitalized | 13,000 | 9,100 | $ 8,500
Deferred debt issuance costs, net of amortization | 18,000 | 17,100 |
Original issuance discounts, net of accretion | 3,500 | 4,300 |
Valuation allowance for deferred tax assets | 0 | 0 |
Operating lease, right-of-use assets | 1,928,369 | 0 |
Operating lease, liability | 1,971,358 |  |
Adoption of ASU 2016-02 [Member] |  |  |
Summary of Significant Accounting Policies |  |  |
Cumulative effective adjustment to opening Retained earnings | 1,400 |  |
Operating lease, right-of-use assets | 1,900,000 |  |
Operating lease, liability | $ 2,000,000 |  |
U.S. |  |  |
Summary of Significant Accounting Policies |  |  |
Number of stores | store | 5,439 |  |
Number of states, in which the Company operates | state | 47 |  |
Mexico |  |  |
Summary of Significant Accounting Policies |  |  |
Number of stores | store | 21 |  |
Other Assets [Member] |  |  |
Summary of Significant Accounting Policies |  |  |
Deferred debt issuance costs, net of amortization | $ 1,100 | $ 1,500 |
Loyalty Program Points [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01 |  |  |
Summary of Significant Accounting Policies |  |  |
Deferred revenue, period expect to be recognized within | 12 months |  |
Loyalty Program Coupon [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01 |  |  |
Summary of Significant Accounting Policies |  |  |
Deferred revenue, period expect to be recognized within | 3 months |  |

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