Debt Maturities of Long Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Long-term Debt, Fiscal Year Maturity [Abstract]
Final Maturity Balances - First Year	$ 20,000	$ 10,000
Final Maturity Balances - Second Year	25,000	20,000
Final Maturity Balances - Third Year	0	25,000
Long-term Debt, Maturities, Repayments of Principal in Year Four	0	0
Long-term Debt, Maturities, Repayments of Principal in Year Five	0	0
Final Maturity Balances - Total	$ 45,000	$ 55,000
Final Maturity Weighted Average Rate - First Year	1.70%	1.50%
Final Maturity Weighted Average Rate - Second Year	2.02%	1.70%
Final Maturity Weighted Average Rate - Third Year	0.00%	2.02%
Long-Term Debt Maturities, Weighted Average Rate, Repayments of Principal in Year Four	0.00%	0.00%
Long-Term Debt Maturities, Weighted Average Rate, Repayments of Principal in Year Five	0.00%	0.00%
Final Maturity Weighted Average Rate - Total	1.88%	1.81%