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5. Interest Income and Interest Expense (Tables)
9 Months Ended
Sep. 30, 2017
Interest Income And Interest Expense Tables  
Interest income
      Three Months Ended     Nine Months Ended  
      September 30,     September 30,  
        2017       2016       2017       2016  
        (In thousands)       (In thousands)  
                   
Interest on finance receivables     $ 106,830     $ 105,296     $ 318,670     $ 303,548  
Other interest income       184       80       404       200  
Interest income     $ 107,014     $ 105,376     $ 319,074     $ 303,748  
Interest expense
    Three Months Ended     Nine Months Ended  
    September 30,     September 30,  
      2017       2016       2017       2016  
      (In thousands)       (In thousands)  
                 
Securitization trust debt   $ 20,973     $ 18,228     $ 61,589     $ 49,867  
Warehouse lines of credit     1,994       2,111       6,081       6,777  
Residual interest financing           227             744  
Subordinated renewable notes     350       327       971       1,054  
Interest expense   $ 23,317     $ 20,893     $ 68,641     $ 58,442