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SIGNIFICANT ACCOUNTING POLICIES - INVESTMENT IN TERMINAL JOINT VENTURE (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Investments in affiliates |  |  |  |  |
Investment in Terminal Joint Venture | $ 86.7 |  | $ 86.7 |  | $ 87.0
Financial information for equity method investment |  |  |  |  |
Company Share of Net Income | 0.9 | $ 9.1 | 9.4 | $ 19.6 |
SSAT |  |  |  |  |
Financial information for equity method investment |  |  |  |  |
Operating revenue | 268.8 | 266.1 | 536.9 | 517.0 |
Operating costs and expenses | (265.0) | (240.4) | (509.2) | (460.1) |
Operating Income | 3.8 | 25.7 | 27.7 | 56.9 |
Net Income | $ 4.2 | $ 24.3 | $ 26.8 | $ 55.0 |

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