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Summary Of Significant Accounting Policies Summary of Adoption of New Accounting Pronouncements (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Mar. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Operating Lease, Right-of-Use Asset | $ 368,856 |  | $ 352,679 | $ 0 | $ 0 |  |
Prepaid expenses and other current assets | 100,800 |  |  | 79,500 | 76,399 |  |
Operating Lease, Liability, Current | 60,804 |  | 57,207 | 0 | 0 |  |
Deferred income taxes | 82,418 |  |  | 78,155 | 70,351 |  |
Total assets | 2,662,447 |  | 2,721,400 | 2,368,721 | 2,246,950 |  |
Accrued Liabilities, Current | 200,816 |  | 272,338 | 275,684 | 191,511 |  |
Operating Lease, Liability, Noncurrent | 345,063 |  | 329,865 | 0 | 0 |  |
Income taxes payable | 6,416 |  |  | 22,763 | 4,000 |  |
Total current liabilities | 577,981 |  | 626,743 | 572,882 | 486,323 |  |
Other Liabilities, Noncurrent | 22,475 |  | 14,167 | 45,214 | 45,412 |  |
Total liabilities | 1,007,253 |  | 1,031,087 | 678,408 | 592,575 |  |
Retained earnings | 1,656,392 |  |  | 1,677,920 | 1,623,612 |  |
Accumulated other comprehensive loss | (1,298) | $ (3,318) |  | (4,063) | (6,374) | $ (8,949) | $ (8,887)
Total liabilities and equity | $ 2,662,447 |  | 2,721,400 | $ 2,368,721 | 2,246,950 |  |
Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Operating Lease, Right-of-Use Asset |  |  | 352,679 |  |  |  |
Operating Lease, Liability, Current |  |  | 57,207 |  |  |  |
Total assets |  |  | 352,679 |  |  |  |
Accrued Liabilities, Current |  |  | (3,346) |  |  |  |
Operating Lease, Liability, Noncurrent |  |  | 329,865 |  |  |  |
Total current liabilities |  |  | 53,861 |  |  |  |
Other Liabilities, Noncurrent |  |  | (31,047) |  |  |  |
Total liabilities |  |  | 352,679 |  |  |  |
Total liabilities and equity |  |  | $ 352,679 |  |  |  |
Accounting Standards Update 2017-12 [Member] |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Accumulated other comprehensive loss |  |  |  |  | $ (99) |  |

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