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Fair Value - Financial Instruments Not Carried at Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Carrying Value    
Carrying values and fair value measurements of financial instruments not carried at fair value    
Agent loans $ 66,368 $ 69,212
Long-term borrowings 94,070 96,113
Fair Value | Level 3    
Carrying values and fair value measurements of financial instruments not carried at fair value    
Agent loans 68,957 73,854
Long-term borrowings $ 103,981 $ 113,054