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Comprehensive Income (AOCI Rollforward) (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Beginning balance | $ 1,857,074,747 | $ 1,969,977,496 | $ 1,861,751,660 | [1] | $ 2,049,518,261
Comprehensive Income | 109,733,580 | 106,331,889 | 215,338,595 |  | 219,242,966
Ending balance | 1,904,334,235 | 1,921,499,312 | 1,904,334,235 |  | 1,921,499,312
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Beginning balance | (275,734) | 2,212,989 | (1,600,338) |  | 7,193,383
Ending balance | 499,221 | (479,104) | 499,221 |  | (479,104)
Foreign currency translation adjustments |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Beginning balance | (1,375,888) | 2,271,208 | (1,674,887) |  | 645,030
Other Comprehensive income (loss) before reclassifications | (475,686) | (2,465,603) | (176,687) |  | (839,425)
Comprehensive Income | (475,686) | (2,465,603) | (176,687) |  | (839,425)
Ending balance | (1,851,574) | (194,395) | (1,851,574) |  | (194,395)
Unrealized gains (losses) on available-for-sale debt securities |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Beginning balance | 1,100,154 | (33,160) | 74,549 |  | (16,349)
Other Comprehensive income (loss) before reclassifications | 1,353,661 | (238,555) | 2,449,241 |  | 309,951
Amounts reclassified from accumulated other comprehensive income | (103,020) | (224) | (172,995) |  | (565,541)
Comprehensive Income | 1,250,641 | (238,779) | 2,276,246 |  | (255,590)
Ending balance | 2,350,795 | (271,939) | 2,350,795 |  | (271,939)
Unrealized gains (losses) on derivatives |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Beginning balance | 0 | (25,059) | 0 |  | (78,026)
Other Comprehensive income (loss) before reclassifications | 0 | 17,246 | 0 |  | 60,419
Amounts reclassified from accumulated other comprehensive income | 0 | (4,957) | 0 |  | 4,837
Comprehensive Income | 0 | 12,289 | 0 |  | 65,256
Ending balance | $ 0 | $ (12,770) | $ 0 |  | $ (12,770)
[1] | The condensed consolidated balance sheet at December 31, 2018 has been derived from the audited financial statements at that date but does not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements.

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e557-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669625-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669619-108580 + Details
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