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Comprehensive Income (Reclassification Out of Accumulated Other Comprehensive Income) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Provision for income taxes | $ (84,163,850) | $ (125,004,782) | $ (162,969,497)
Amounts Reclassified from Other Comprehensive Income |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Total reclassifications for the period | 1,682,208 | (264,257) | (1,182,844)
Amounts Reclassified from Other Comprehensive Income | Unrealized gains and (losses) on available-for-sale securities |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Realized gain (loss) | 2,006,235 | 933,778 | 320,197
Provision for income taxes | (421,309) | (326,822) | (112,069)
Total reclassifications for the period | 1,584,926 | 606,956 | 208,128
Amounts Reclassified from Other Comprehensive Income | Unrealized gains (losses) on derivatives |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Realized gain (loss) | 123,142 | (1,340,329) | (2,139,958)
Provision for income taxes | (25,860) | 469,116 | 748,986
Total reclassifications for the period | $ 97,282 | $ (871,213) | $ (1,390,972)

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