Credit Facilities and Long-Term Debt, Deferred Financing Costs (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Amortization for Future Years [Abstract]
2019	$ 223
2020	224
2021	223
2022	224
2023	205
Total amortization	1,099	$ 1,000
JPMorgan Chase Bank Credit Facility [Member]
Amortization for Future Years [Abstract]
Total amortization	$ 500