Long-Term Debt - Credit Facility Net Interest Expense (Details) - Revolving Credit Facility - Line of Credit - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Interest Expense and Amortization of Debt Issue Costs
Interest expense	$ 1,805	$ 552	$ 5,504	$ 1,267
Debt issue cost amortization	275	141	737	424
Unused facility fee	63	153	203	481
Total	$ 2,143	$ 846	$ 6,444	$ 2,172