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Comprehensive Income (AOCI Rollforward) (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Balance at beginning of period | [1] |  |  | $ 1,910,424,234 |
Comprehensive Income |  | $ 90,971,869 | $ 84,901,726 | 190,545,149 | $ 164,420,474
Balance at end of period |  | 2,003,936,423 |  | 2,003,936,423 |
Accumulated other comprehensive income (loss), end of period |  | 3,181,156 | (3,475,598) | 3,181,156 | (3,475,598)
Foreign currency translation adjustments |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Balance at beginning of period |  | (2,674,409) | 279,935 | (2,862,999) | (44,909)
Other Comprehensive income (loss) before reclassifications |  | 1,495,210 | (1,753,823) | 1,683,800 | (1,428,979)
Comprehensive Income |  | 1,495,210 | (1,753,823) | 1,683,800 | (1,428,979)
Balance at end of period |  | (1,179,199) | (1,473,888) | (1,179,199) | (1,473,888)
Unrealized gains on available-for-sale securities: |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Balance at beginning of period |  | 4,199,640 | 622,330 | 2,788,975 | 829,907
Other Comprehensive income (loss) before reclassifications |  | 1,164,243 | 232,539 | 2,739,626 | (275,809)
Amounts reclassified from accumulated other comprehensive income |  | (545,206) | 16,076 | (709,924) | 316,847
Comprehensive Income |  | 619,037 | 248,615 | 2,029,702 | 41,038
Balance at end of period |  | 4,818,677 | 870,945 | 4,818,677 | 870,945
Unrealized gains (losses) on derivatives |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Balance at beginning of period |  | (779,997) | (2,794,347) | (1,197,281) | (1,915,834)
Other Comprehensive income (loss) before reclassifications |  | (23,617) | (437,811) | 123,701 | (1,675,287)
Amounts reclassified from accumulated other comprehensive income |  | 345,292 | 359,503 | 615,258 | 718,466
Comprehensive Income |  | 321,675 | (78,308) | 738,959 | (956,821)
Balance at end of period |  | $ (458,322) | $ (2,872,655) | $ (458,322) | $ (2,872,655)
[1] | Note: The condensed consolidated balance sheet at December 31, 2016 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e557-108580 + Details
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