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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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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.

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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