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Accounting Policies - Joint Ventures (Details 10) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Schedule of Equity Method Investments [Line Items] |  |  |
Revenues | $ 5,680,733 | $ 5,532,750 | $ 5,336,776
Operating income | 534,219 | 544,925 | $ 481,220
Receivables | 946,741 | 873,986 |
Equity Method Investment, Nonconsolidated Investee, Other |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity Method Investments | 1,300 | 425 |
Income (Loss) from Equity Method Investments | 892 | (32) |
Joint Venture, Proportionate Consolidation |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Revenues | 14,700 | 69,700 |
Operating income | 4,700 | 20,600 |
Receivables | $ 1,200 | $ 1,800 |
Minimum |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity Method Investment, Ownership Percentage | 33.00% |  |
Maximum |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity Method Investment, Ownership Percentage | 50.00% |  |

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