Derivatives and Hedging Activities - Income Statement Effect (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income	$ 2,664,915	$ 0	$ 1,562,469	$ 0
Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Total amounts of income and expense line items presented in the statement of financial performance in which the effects of fair value or cash flow hedges are recorded	(671,294)	(175,254)	(1,278,980)	(177,586)
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income	236,103	0	417,324	0
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income as a result that a forecasted transaction is no longer probable of occurring	0	0	0	0
Foreign Currency Adjustment
Derivative Instruments, Gain (Loss) [Line Items]
Total amounts of income and expense line items presented in the statement of financial performance in which the effects of fair value or cash flow hedges are recorded	4,216	(9,229)	107,259	(11,429)
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income	2,428,813	0	1,145,146	0
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income as a result that a forecasted transaction is no longer probable of occurring	$ 0	$ 0	$ 0	$ 0