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Fair Value of Financial Instruments (Schedule of Summarized Financial Information of Equity Method Investments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total current assets | $ 2,359,015 |  |  |  | $ 2,173,559 |  |  |  | $ 2,359,015 | $ 2,173,559 |
Total assets | 5,227,849 |  |  |  | 4,997,006 |  |  |  | 5,227,849 | 4,997,006 | $ 4,440,000
Current liabilities | 1,415,199 |  |  |  | 1,219,126 |  |  |  | 1,415,199 | 1,219,126 |
Total liabilities | 3,222,324 |  |  |  | 3,205,315 |  |  |  | 3,222,324 | 3,205,315 |
Revenue | 1,636,800 | $ 1,698,300 | $ 1,569,300 | $ 1,416,600 | 1,709,300 | $ 2,016,600 | $ 1,939,000 | $ 1,518,300 | 6,320,975 | 7,183,188 | 6,909,417
Net income | 112,900 | $ 116,900 | $ 56,800 | $ 36,100 | 100,700 | $ 130,100 | $ 120,200 | $ 43,100 | 322,699 | 394,096 | 259,231
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total current assets | 160,300 |  |  |  | 144,500 |  |  |  | 160,300 | 144,500 |
Long-term assets | 1,395,400 |  |  |  | 1,359,900 |  |  |  | 1,395,400 | 1,359,900 |
Total assets | 1,555,700 |  |  |  | 1,504,400 |  |  |  | 1,555,700 | 1,504,400 |
Current liabilities | 56,000 |  |  |  | 34,900 |  |  |  | 56,000 | 34,900 |
Long-term liabilities | 1,024,500 |  |  |  | 978,600 |  |  |  | 1,024,500 | 978,600 |
Total liabilities | $ 1,080,500 |  |  |  | $ 1,013,500 |  |  |  | 1,080,500 | 1,013,500 |
Revenue |  |  |  |  |  |  |  |  | 169,200 | 152,400 | 145,800
Net income |  |  |  |  |  |  |  |  | $ 94,700 | $ 82,800 | $ 72,400

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