Debt Maturities of Long Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Long-term Debt, Fiscal Year Maturity [Abstract]
Final Maturity Balances - First Year	$ 0	$ 0
Final Maturity Balances - Second Year	10,000	0
Final Maturity Balances - Third Year	20,000	10,000
Long-term Debt, Maturities, Repayments of Principal in Year Four	25,000	20,000
Long-term Debt, Maturities, Repayments of Principal in Year Five	0	25,000
Final Maturity Balances - Total	$ 55,000	$ 55,000
Final Maturity Weighted Average Rate - First Year	0.00%	0.00%
Final Maturity Weighted Average Rate - Second Year	1.50%	0.00%
Final Maturity Weighted Average Rate - Third Year	1.70%	1.50%
Long-Term Debt Maturities, Weighted Average Rate, Repayments of Principal in Year Four	2.02%	1.70%
Long-Term Debt Maturities, Weighted Average Rate, Repayments of Principal in Year Five	0.00%	2.02%
Final Maturity Weighted Average Rate - Total	1.81%	1.81%