Derivatives and Hedging Activities - Fair Value of Derivatives and Balance Sheet Classification (Details) - Designated as hedging instrument - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 739,606	$ 0
Liability Derivatives	(3,067,572)	0
Interest rate products | Other assets - current
Derivatives, Fair Value [Line Items]
Asset Derivatives	243	0
Interest rate products | Other assets - non-current
Derivatives, Fair Value [Line Items]
Asset Derivatives	84,058	0
Interest rate products | Other liabilities - current
Derivatives, Fair Value [Line Items]
Liability Derivatives	(71,915)	0
Cross currency contract | Other assets - current
Derivatives, Fair Value [Line Items]
Asset Derivatives	655,305	0
Cross currency contract | Long-term derivative liability
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ (2,995,657)	$ 0