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Segments and Related Information (Reconciliation of Consolidated Income before Income Taxes to EBITDA) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
EBITDA Reconciliation: |  |  |
Income before income taxes | $ 425,164 | $ 510,939 | $ 365,303
Interest expense, net | 59,629 | 77,026 | 82,571
Depreciation | 258,841 | 212,485 | 192,332
Amortization of intangible assets | 38,910 | 22,997 | 20,598
EBITDA | $ 782,500 | $ 823,400 | $ 660,800

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