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Fair Value of Financial Instruments (Tables)
 9 Months Ended
Sep. 30, 2021
Fair Value Disclosures [Abstract]  
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis
The following tables summarize our financial assets and liabilities that are measured at fair value on a recurring basis and the fair value measurements, by level, within the fair value hierarchy as of September 30, 2021 and December 31, 2020:
 Fair Value Measurements Using:
As of September 30, 2021Fair ValueQuoted Prices in
Active Markets
(Level 1)		Significant Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)
(in thousands)
Assets:
Investments—equity securities$23 $23 $— $— 
Investments—guaranteed income fund2,016 — — 2,016 
Investments—mutual funds and other9,451 9,451 — — 
Total investments11,490 9,474 — 2,016 
Derivative assets12,185 — 12,185 — 
Total assets$23,675 $9,474 $12,185 $2,016 
Liabilities:
Derivative liabilities$1,969 $— $1,969 $— 
 
 Fair Value Measurements Using:
As of December 31, 2020Fair ValueQuoted Prices in
Active Markets
(Level 1)		Significant Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)
(in thousands)
Assets:
Investments—equity securities$21 $21 $— $— 
Investments—guaranteed income fund2,156 — — 2,156 
Investments—mutual funds and other8,599 8,599 — — 
Total investments10,776 8,620 — 2,156 
Derivative assets 3,269 — 3,269 — 
Total assets$14,045 $8,620 $3,269 $2,156 
Liabilities:
Derivative liabilities $127 $— $127 $— 
Summary of Changes in Fair Value of Investments
The following table sets forth the summary of the changes in the fair value of Level 3 investments for the nine months ended September 30, 2021 and 2020:
     
Nine months ended September 30,
20212020
(in thousands) 
Beginning Balance$2,156 $803 
Purchases and adjustments77 243 
Transfers— 1,579 
Distribution(241)(514)
Investment income24 18 
Ending Balance$2,016 $2,129