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Unaudited Condensed Consolidated Statements of Comprehensive Income - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Statement of Comprehensive Income [Abstract] |  |
Net income | $ 104,280,411 | $ 111,248,743
Other comprehensive income (loss) before tax: |  |
Foreign currency translation adjustments | 298,999 | 1,626,178
Unrealized gains on derivatives | 0 | 67,047
Unrealized gains (losses) on debt securities, net | 1,298,236 | (21,280)
Other comprehensive income, before tax | 1,597,235 | 1,671,945
Expense for income taxes related to components of other comprehensive income | 272,631 | 9,611
Other comprehensive income, net of tax | 1,324,604 | 1,662,334
Comprehensive Income | $ 105,605,015 | $ 112,911,077

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