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Consolidated Statement of Comprehensive Income - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Statement of Comprehensive Income [Abstract] |  |  |
Net Income | $ 347,591,276 | $ 318,469,859 | $ 288,604,579
Other comprehensive income (loss) before tax: |  |  |
Foreign currency translation adjustments | (2,818,090) | (1,448,808) | (1,104,023)
Unrealized gains (losses) on derivatives | 1,105,468 | (1,471,736) | (1,475,702)
Unrealized gains (losses) on available-for-sale securities, net | 3,013,951 | (15,443,716) | (13,229,414)
Other comprehensive income (loss), before tax | 1,301,328 | (18,364,260) | (15,809,139)
Expense (Benefit) for income taxes related to components of other comprehensive income (loss) | 1,441,798 | (5,920,409) | (5,146,791)
Other comprehensive (loss), net of tax | (140,469) | (12,443,851) | (10,662,348)
Comprehensive Income | $ 347,450,807 | $ 306,026,008 | $ 277,942,231

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