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Schedule II - Valuation and Qualifying Accounts and Reserves (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
Movement in Valuation Allowances and Reserves [Roll Forward]        
Balance at Beginning of Period $ 154,631 $ 165,459 $ 156,454  
Charged to Costs and Expenses 1,753 (8,296) 37,616  
Adjustments to Valuation Accounts (9,318) 15,838 (98)  
Deductions (2,709) (18,370) (28,513)  
Balance at End of Period 154,631 165,459 156,454 $ 144,357
Reserve for loan losses        
Movement in Valuation Allowances and Reserves [Roll Forward]        
Balance at Beginning of Period 85,545 108,165 98,490  
Charged to Costs and Expenses (5,828) (12,514) 36,567  
Adjustments to Valuation Accounts 0 0 0  
Deductions (1,228) (10,106) (26,892)  
Balance at End of Period 85,545 108,165 98,490 78,489
Allowance for doubtful accounts        
Movement in Valuation Allowances and Reserves [Roll Forward]        
Balance at Beginning of Period 2,588 3,384 3,646  
Charged to Costs and Expenses 473 985 1,359  
Adjustments to Valuation Accounts 0 0 0  
Deductions (451) (1,781) (1,621)  
Balance at End of Period 2,588 3,384 3,646 2,610
Allowance for deferred tax assets        
Movement in Valuation Allowances and Reserves [Roll Forward]        
Balance at Beginning of Period 66,498 53,910 54,318  
Charged to Costs and Expenses 7,108 3,233 (310)  
Adjustments to Valuation Accounts (9,318) 15,838 (98)  
Deductions (1,030) (6,483) 0  
Balance at End of Period $ 66,498 $ 53,910 $ 54,318 $ 63,258