Reportable Segments - Revenue and Total Assets by Geographic Area (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Revenues and total assets by geographic area
% of Revenue	100.00%	100.00%
Non-United States
Revenues and total assets by geographic area
% of Revenue	4.20%	4.60%
% of total assets	3.40%		4.40%