Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Cash and Cash Equivalents (Details)

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Summary of Significant Accounting Policies - Cash and Cash Equivalents (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Cash and Cash Equivalents [Line Items]            
Cash and cash equivalents $ 1,696,210 $ 212,473 $ 184,620 $ 216,935 $ 530,670 $ 164,798
Cash equivalents 1,630,000   98,000      
Domestic Bank Accounts            
Cash and Cash Equivalents [Line Items]            
Cash and cash equivalents 1,664,990   156,122      
Foreign Bank Accounts            
Cash and Cash Equivalents [Line Items]            
Cash and cash equivalents 31,220   28,498      
Domestic Joint Ventures            
Cash and Cash Equivalents [Line Items]            
Cash and cash equivalents 13,377   7,714      
Foreign Joint Ventures            
Cash and Cash Equivalents [Line Items]            
Cash and cash equivalents 4,568   3,973      
Investments in Joint Ventures            
Cash and Cash Equivalents [Line Items]            
Cash and cash equivalents 17,945   11,687      
Captive Insurance Company            
Cash and Cash Equivalents [Line Items]            
Cash and cash equivalents 132,916   85,014      
Cash Not Held by Joint Ventures            
Cash and Cash Equivalents [Line Items]            
Cash and cash equivalents $ 1,545,349   $ 87,919