Debt Instruments - Maturities Schedule (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Principal
Long-term Debt and Capital Lease Obligations, Repayments of Principal in Next Twelve Months	$ 4,472
Principal - 2020	3,759
Principal - 2021	21,618
Principal - 2022	0
Principal - Total	29,849
Interest
Long Term Debt And Capital Lease Obligations Maturities Interest Due Next Twelve Months	1,210
Interest - 2020	992
Interest - 2021	794
Interest - 2022	0
Interest - Total	2,996
Total
Long-term Debt and Capital Lease Obligations, Maturities, Total Payments Due Next Twelve Months	5,682
Total - 2020	4,751
Total - 2021	22,412
Total - 2022	0
Total	32,845
Interest expense	$ 5,200	$ 1,900	$ 1,100