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Consolidated Statements of Patronage Capital and Membership Fees - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Components of comprehensive margin:                
Net margin $ 18,286     $ 11,334     $ 51,265 $ 56,019
Patronage Capital and Membership Fees                
Increase (Decrease) in Members' Capital                
Beginning balance 995,265 $ 985,882 $ 962,286 955,771 $ 938,486 $ 911,087 962,286 911,087
Components of comprehensive margin:                
Net margin 18,286 9,383 23,596 11,335 17,285 27,399    
Ending balance $ 1,013,551 $ 995,265 $ 985,882 $ 967,106 $ 955,771 $ 938,486 $ 1,013,551 $ 967,106