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Recently Issued Accounting Standards - Narrative (Details) - USD ($) | Mar. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018 | Jan. 01, 2018
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Operating lease liabilities recognized | $ 37,840,077 |  |  |
Right-of-use assets, operating leases | 36,759,065 |  |  |
Cumulative-effect adjustment to deferred taxes | $ 1,508,084 |  | $ 252,988 |
Accounting Standards Update 2016-02 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Operating lease liabilities recognized |  | $ 38,016,006 |  |
Right-of-use assets, operating leases |  | 37,072,072 |  |
Cumulative-effect of new accounting principle |  | 4,622,500 |  | $ 0
Cumulative-effect adjustment to deferred taxes |  | 1,310,850 |  |
Retained Earnings | Accounting Standards Update 2016-02 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cumulative-effect of new accounting principle |  | $ 4,622,500 |  | $ (10,864)

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