Debt - Schedule of Amounts Borrowed Under Wells Fargo Revolving Credit Agreement (Details) - Wells Fargo Credit Agreement - Wells Fargo revolving credit facility - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Line of Credit Facility [Line Items]
Average borrowings under Wells Fargo Revolving Credit Facility	$ 48,235	$ 47,031
Average Interest Cost on Wells Fargo Revolving Credit Facility	6.30%	6.51%
Accrued and unpaid interest	$ 400	$ 174
LIBOR
Line of Credit Facility [Line Items]
LIBOR loan interest rate	5.00%	5.97%
Prime Rate
Line of Credit Facility [Line Items]
Wells Fargo Prime Rate (Base Rate) loan interest rate	6.25%	7.25%