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Investments in Equity Affiliates, Statements of Operations (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Revenue: |  |  |  |
Total revenues | $ 32,429,382 | $ 71,040,665 | $ 108,195,846 | $ 172,929,878
Total expenses | 40,214,486 | 47,256,537 | 120,232,132 | 128,120,821
Net (loss) income | (7,785,104) | 23,784,128 | (12,036,286) | 44,809,057
Arbor's share of (loss) income | $ (1,230,905) | $ 4,167,233 | $ (1,844,144) | $ 8,885,528

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