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Related Party Transactions (Related Party Transactions Entered Into During the Period) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Related party transactions entered into for the time periods presented      
Sales revenues $ 176,768 $ 246,540 $ 358,856
Service fee revenues 0 12,181 20,843
Purchases of product (b) 52,665 569,619 741,736
Lease income 583 3,516 6,523
Labor and benefits reimbursement 0 10,973 $ 13,487
Accounts receivable 5,623 10,603  
Accounts payable $ 5,251 $ 12,303