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Investments and Notes Receivable (Tables)
 9 Months Ended
Sep. 30, 2019
Investments [Abstract]  
Summary of Investments and Notes Receivable
A summary of the Company's investments and notes receivable follows:
As of September 30, 2019As of December 31, 2018
Amortized costGross unrealized gainsGross unrealized lossesFair valueAmortized costGross unrealized gainsGross unrealized lossesFair value
Investments (at fair value):
Student loan asset-backed and other debt securities - available-for-sale
$48,772  3,802  —  52,574  47,931  5,109  —  53,040  
Equity securities13,913  4,114  (725) 17,302  12,909  5,145  (407) 17,647  
Total investments (at fair value)$62,685  7,916  (725) 69,876  60,840  10,254  (407) 70,687  
Other Investments and Notes Receivable (not measured at fair value):
Venture capital and funds:
Measurement alternative
71,752  70,939  
Equity method
11,396  19,230  
Other
850  900  
Total venture capital and funds83,998  91,069  
Real estate:
Equity method
44,995  29,168  
Other
1,372  34,211  
  Total real estate
46,367  63,379  
Beneficial interest in consumer loan securitization5,755  —  
Tax liens and affordable housing6,420  7,862  
Notes receivable—  16,373  
Total investments and notes receivable (not measured at fair value)142,540  178,683  
      Total investments and notes receivable
$212,416  249,370