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Summary Of Significant Accounting Policies - New Accounting Standards (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2020 | Jan. 01, 2021 | Jan. 01, 2020 | Dec. 31, 2019 | Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Total operating lease liabilities | $ 152,608 |  |  | $ 205,612 |
Operating lease right-of-use assets | 149,656 |  |  | 201,118 |
Retained earnings | 464,524 |  |  | 445,370 |
Long-term debt | 349,563 |  |  | 405,853 |
Common stock | 1,327,592 |  |  | 1,318,961 |
Deferred tax liabilities | 110,821 |  |  | $ 112,132 |
Accounting Standards Update 2016-02 Cumulative Effect, Period of Adoption |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Total operating lease liabilities |  |  |  |  | $ 259,000
Operating lease right-of-use assets |  |  |  |  | 253,400
Retained earnings |  |  |  |  | 4,600
Tax effect of deferred gain on sale and leaseback transaction |  |  |  |  | $ 900
Accounting Standards Update 2016-13 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Provision for credit losses on accounts receivable | $ 700 |  |  |  |
Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Retained earnings |  |  | $ (600) |  |
Tax effect of credit losses |  |  | $ (200) |  |
Accounting Standards Update 2020-06 [Member] | Cumulative Effect, Period of Adoption | Forecast |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Retained earnings |  | $ 6,700 |  |  |
Long-term debt |  | 44,100 |  |  |
Common stock |  | (41,500) |  |  |
Deferred tax liabilities |  | $ (9,300) |  |  |

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