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Schedule II - Valuation and Qualifying Accounts and Reserves (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2016
Movement in Valuation Allowances and Reserves [Roll Forward]        
Balance at Beginning of Period $ 165,459 $ 156,454 $ 439,323  
Charged to Costs and Expenses (8,296) 37,616 (5,886)  
Adjustments to Valuation Accounts 15,838 (98) 4,302  
Deductions (18,370) (28,513) (281,285)  
Balance at End of Period 165,459 156,454 439,323 $ 154,631
Reserve for loan losses        
Movement in Valuation Allowances and Reserves [Roll Forward]        
Balance at Beginning of Period 108,165 98,490 377,204  
Charged to Costs and Expenses (12,514) 36,567 (1,714)  
Adjustments to Valuation Accounts 0 0 0  
Deductions (10,106) (26,892) (277,000)  
Balance at End of Period 108,165 98,490 377,204 85,545
Allowance for doubtful accounts        
Movement in Valuation Allowances and Reserves [Roll Forward]        
Balance at Beginning of Period 3,384 3,646 5,857  
Charged to Costs and Expenses 985 1,359 2,074  
Adjustments to Valuation Accounts 0 0 0  
Deductions (1,781) (1,621) (4,285)  
Balance at End of Period 3,384 3,646 5,857 2,588
Allowance for deferred tax assets        
Movement in Valuation Allowances and Reserves [Roll Forward]        
Balance at Beginning of Period 53,910 54,318 56,262  
Charged to Costs and Expenses 3,233 (310) (6,246)  
Adjustments to Valuation Accounts 15,838 (98) 4,302  
Deductions (6,483) 0 0  
Balance at End of Period $ 53,910 $ 54,318 $ 56,262 $ 66,498