Reportable Segments - Revenue and Total Assets by Geographic Area (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Revenues and total assets by geographic area
% of Revenue	100.00%	100.00%	100.00%	100.00%
Non-United States
Revenues and total assets by geographic area
% of Revenue			3.30%	5.00%
% of total assets			3.50%		4.40%