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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Narrative) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative effect of new accounting principle in period of adoption | $ (2,423,036) |  |
Revenues | 372,970,373 | $ 385,945,564 |
Retained Earnings (Accumulated Deficit) |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative effect of new accounting principle in period of adoption | (2,423,036) |  | $ 2,400,000
Deferred Contract Fulfillment Costs |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Deferred revenue | 1,300,000 | 2,300,000 |
Revenues | 8,100,000 |  |
Voyage revenue |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Revenues | 319,753,056 | $ 338,540,738 |
Accounting Standards Update 2014-09 | Voyage revenue |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Deferred revenue | $ 1,700,000 |  | $ 4,700,000

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