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Property and Equipment (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Property and Equipment |  |  |
Depreciation and amortization expense | $ 270,875 | $ 258,937 | $ 233,845
Impairment of long-lived assets | 1,900 | 11,400 |
Property and equipment [Member] |  |  |
Property and Equipment |  |  |
Depreciation and amortization expense | $ 267,300 | $ 246,000 | $ 232,700

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