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Schedule II - Valuation and Qualifying Accounts and Reserves (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2020
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]        
Balance at Beginning of Period $ 110,221 $ 134,773 $ 144,357  
Charged to Costs and Expenses 11,753 7,324 33,086  
Adjustments to Valuation Accounts 729 0 0  
Deductions (27,755) (31,876) (42,670)  
Balance at End of Period 110,221 134,773 144,357 $ 94,948
Reserve for loan losses        
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]        
Balance at Beginning of Period 28,634 53,395 78,489  
Charged to Costs and Expenses 9,696 6,482 16,937  
Adjustments to Valuation Accounts 729 0 0  
Deductions (25,889) (31,243) (42,031)  
Balance at End of Period 28,634 53,395 78,489 13,170
Allowance for doubtful accounts        
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]        
Balance at Beginning of Period 1,942 3,271 2,610  
Charged to Costs and Expenses 1,601 (696) 1,300  
Adjustments to Valuation Accounts 0 0 0  
Deductions (1,866) (633) (639)  
Balance at End of Period 1,942 3,271 2,610 1,677
Allowance for deferred tax assets        
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]        
Balance at Beginning of Period 79,645 78,107 63,258  
Charged to Costs and Expenses 456 1,538 14,849  
Adjustments to Valuation Accounts 0 0 0  
Deductions 0 0 0  
Balance at End of Period $ 79,645 $ 78,107 $ 63,258 $ 80,101