Reportable Segments (Geographical) (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Total Revenue | United States
Segment Reporting Information [Line Items]
Concentration risk (percent)	55.00%	71.00%	79.00%
Total Revenue | The Netherlands
Segment Reporting Information [Line Items]
Concentration risk (percent)	21.00%	5.00%	0.00%
Total Revenue | Ireland
Segment Reporting Information [Line Items]
Concentration risk (percent)	12.00%	17.00%	19.00%
Total Revenue | United Kingdom
Segment Reporting Information [Line Items]
Concentration risk (percent)	7.00%	7.00%	2.00%
Total Revenue | Germany
Segment Reporting Information [Line Items]
Concentration risk (percent)	3.00%	0.00%	0.00%
Total Revenue | Poland
Segment Reporting Information [Line Items]
Concentration risk (percent)	2.00%	0.00%	0.00%
Total Assets | United States
Segment Reporting Information [Line Items]
Concentration risk (percent)	47.00%	55.00%
Total Assets | The Netherlands
Segment Reporting Information [Line Items]
Concentration risk (percent)	17.00%	15.00%
Total Assets | Ireland
Segment Reporting Information [Line Items]
Concentration risk (percent)	11.00%	18.00%
Total Assets | United Kingdom
Segment Reporting Information [Line Items]
Concentration risk (percent)	18.00%	7.00%
Total Assets | Germany
Segment Reporting Information [Line Items]
Concentration risk (percent)	3.00%	5.00%
Total Assets | Poland
Segment Reporting Information [Line Items]
Concentration risk (percent)	4.00%	0.00%