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Summary of Significant Accounting Policies (Narrative) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) segment state store | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Summary of Significant Accounting Policies |  |  |
Number of reportable segments | segment | 1 |  |
Accounts receivable due from employees to the Company | $ 900 | $ 900 |
Allowance for doubtful supplier receivables | 0 | 0 |
Replacement cost of inventory | 3,670,000 | 3,470,000 |
LIFO inventory value in excess of replacement cost of inventory | 55,800 | 31,000 |
Goodwill impairment | 0 | 0 |
Impairment of long-lived assets | 3,400 | 1,900 | $ 11,400
Self-insurance reserves, current | 109,199 | 79,079 |
Equity method investment in VIEs, net | 19,500 |  |
Investment tax credit amount | 170,500 | 8,500 | 19,400
Advertising expense, net | 73,800 | 79,300 | 81,400
Total interest costs capitalized | 10,200 | 13,000 | $ 9,100
Deferred debt issuance costs, net of amortization | 22,300 | 18,000 |
Original issuance discounts, net of accretion | 5,100 | 3,500 |
Valuation allowance for deferred tax assets | 0 | 0 |
Other assets |  |  |
Summary of Significant Accounting Policies |  |  |
Deferred debt issuance costs, net of amortization | $ 600 | $ 1,100 |
U.S. |  |  |
Summary of Significant Accounting Policies |  |  |
Number of stores | store | 5,594 |  |
Number of states, in which the Company operates | state | 47 |  |
Mexico |  |  |
Summary of Significant Accounting Policies |  |  |
Number of stores | store | 22 |  |
Loyalty Program Points [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01 |  |  |
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]: 2021-01-01 |  |  |
Summary of Significant Accounting Policies |  |  |
Deferred revenue, period expect to be recognized within | 3 months |  |

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