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Investments Summary of Assets, Liabilities and Results of Operations for Significant Unconsolidated Joint Ventures (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule of Investments [Line Items]      
Current assets $ 2,206,184 $ 2,225,109  
Total assets 10,450,946 9,860,863 $ 7,581,674
Current liabilities 1,801,849 1,408,996  
Net sales 3,128,909 3,589,427 3,374,950
Gross profit 994,853 1,257,778 1,217,256
Net income 446,615 604,357 739,139
Significant Unconsolidated Joint Ventures      
Schedule of Investments [Line Items]      
Current assets 449,441 473,426  
Noncurrent assets 1,590,204 1,404,765  
Total assets 2,039,645 1,878,191  
Current liabilities 116,136 201,792  
Noncurrent liabilities 769,114 583,839  
Liabilities, Total 885,250 785,631  
Net sales 597,082 910,891 829,590
Gross profit 266,026 496,150 456,518
Income before taxes 225,436 384,690 332,632
Net income $ 157,628 $ 229,733 $ 225,791