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Comprehensive Income (AOCI Rollforward) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period [1]     $ (1,130,836)  
Comprehensive Income $ 95,097,463 $ 69,430,897 259,517,937 $ 216,999,662
Balance at end of period (442,780) (1,761,626) (442,780) (1,761,626)
Foreign currency translation adjustments        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period (1,473,888) 761,692 (44,909) 1,403,899
Other Comprehensive (loss) income before reclassifications 162,343 (396,685) (1,266,636) (1,038,892)
Comprehensive Income 162,343 (396,685) (1,266,636) (1,038,892)
Balance at end of period (1,311,545) 365,007 (1,311,545) 365,007
Unrealized gains on available-for-sale securities:        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period 870,945 8,551,564 829,907 10,868,322
Other Comprehensive (loss) income before reclassifications 2,269,315 (6,353,685) 1,993,505 (5,727,233)
Amounts reclassified from accumulated other comprehensive income (94,489) (1,321,982) 222,359 (4,265,192)
Comprehensive Income 2,174,826 (7,675,667) 2,215,864 (9,992,425)
Balance at end of period 3,045,771 875,897 3,045,771 875,897
Unrealized gains (losses) on derivatives        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period (2,872,655) (2,173,354) (1,915,834) (959,206)
Other Comprehensive (loss) income before reclassifications 353,397 (1,113,648) (1,321,890) (2,327,796)
Amounts reclassified from accumulated other comprehensive income 342,252 284,472 1,060,718 284,472
Comprehensive Income 695,649 (829,176) (261,172) (2,043,324)
Balance at end of period $ (2,177,006) $ (3,002,530) $ (2,177,006) $ (3,002,530)
[1] Note: The condensed consolidated balance sheet at December 31, 2015 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.