Long-Term Debt - Schedule of Financial Covenants (Details)	3 Months Ended
	Mar. 31, 2018 USD ($)
Debt Disclosure [Abstract]
Leverage ratio, actual	2.95
Covenant requirement, total leverage ratio	3.75
Debt service coverage ratio, actual	3.58
Minimum debt service coverage ratio	2.00
Covenant, liquidity balance, actual	$ 122,834,000
Debt instrument covenants minimum liquidity amount	$ 25,000,000