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Advances - Schedule of Activity in Advances (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Advances [Roll Forward]      
Advances, beginning balance $ 834,512 $ 1,066,448 $ 1,209,935
Asset acquisition 6,916 14 1,457
New advances 831,208 890,389 671,673
Sales of advances (1,272) (834) (11,791)
Collections of advances and other (891,914) (1,121,505) (804,826)
Advances, ending balance 779,451 834,512 1,066,448
Advances, net $ 772,433 $ 828,239 $ 1,056,523