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Schedule II - Valuation and Qualifying Accounts and Reserves (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]        
Balance at Beginning of Period $ 134,773 $ 144,357 $ 154,631  
Charged to Costs and Expenses 7,324 33,086 1,753  
Adjustments to Valuation Accounts 0 0 (9,318)  
Deductions (31,876) (42,670) (2,709)  
Balance at End of Period 134,773 144,357 154,631 $ 110,221
Reserve for loan losses        
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]        
Balance at Beginning of Period 53,395 78,489 85,545  
Charged to Costs and Expenses 6,482 16,937 (5,828)  
Adjustments to Valuation Accounts 0 0 0  
Deductions (31,243) (42,031) (1,228)  
Balance at End of Period 53,395 78,489 85,545 28,634
Allowance for doubtful accounts        
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]        
Balance at Beginning of Period 3,271 2,610 2,588  
Charged to Costs and Expenses (696) 1,300 473  
Adjustments to Valuation Accounts 0 0 0  
Deductions (633) (639) (451)  
Balance at End of Period 3,271 2,610 2,588 1,942
Allowance for deferred tax assets        
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]        
Balance at Beginning of Period 78,107 63,258 66,498  
Charged to Costs and Expenses 1,538 14,849 7,108  
Adjustments to Valuation Accounts 0 0 (9,318)  
Deductions 0 0 (1,030)  
Balance at End of Period $ 78,107 $ 63,258 $ 66,498 $ 79,645