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New Accounting Pronouncements (Details) - USD ($)
9 Months Ended 12 Months Ended
Jan. 01, 2020
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Significant Accounting Policies [Line Items]            
Allowance for credit loss $ 49,529,000   $ 91,847,000 $ 30,616,000 $ 32,582,000 $ 30,323,000
Goodwill impairment   $ 0 $ 0 $ 0 $ 0  
ASU 2016-13            
Significant Accounting Policies [Line Items]            
Allowance for credit loss 18,913,000          
Financing receivable, purchased with credit deterioration, discount (premium) 481,000          
ASU 2016-13 | Retained earnings            
Significant Accounting Policies [Line Items]            
Taxes 5,449,000          
Cumulative effect from change in accounting policies $ 12,983,000