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Summary of Significant Accounting Policies Summary of Significant Accounting Policies, Cash Flow (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Net cash provided by operating activities   $ 804,351 $ 628,755 $ 615,830  
Capital expenditures   (222,211) (239,957) (235,545)  
Proceeds from divestitures and sales of property and equipment   21,916 77,074 37,309  
Payment to Acquire Life Insurance Policy, Investing Activities   (5,352) (9,026) (14,760)  
Proceeds from Life Insurance Policy   3,519 415 4,824  
Payments for (Proceeds from) Other Investing Activities   0 0 14,525  
Net Cash Provided by (Used in) Investing Activities   (318,371) (278,511) (414,621)  
Proceeds from issuance of long-term debt   1,585,000 1,149,263 396,349  
Debt issuance costs   (14,503) (15,539) 0  
Scheduled payments of debt   (34,489) (25,471) (34,134)  
Principal payments on finance leases   (43,598) (42,627) (39,686)  
Proceeds from exercise of stock options   26,671 40,922 24,517  
Purchase of Company common stock   (516,870) (129,589) (277,611)  
Payments of dividends   (137,392) (131,402) (123,849)  
Bank overdrafts and other   14,259 328 (15,177)  
Net Cash Provided by (Used in) Financing Activities   (492,778) (319,093) (329,181)  
Effect of foreign currency   2,788 3,885 (5,045)  
Net (decrease) increase in cash, cash equivalents, and restricted cash   (4,010) 35,036 (133,017)  
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 242,620 238,610 $ 242,620 $ 207,584 $ 340,601
Impact From Change in Depreciable Lives $ 4,300 $ 12,100