Segment Information - Identifiable Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Segment Reporting, Asset Reconciling Item [Line Items]
Total identifiable assets	$ 1,866,878	$ 1,763,958
Operating Segments | North America
Segment Reporting, Asset Reconciling Item [Line Items]
Total identifiable assets	1,285,430	1,141,084
Operating Segments | Europe & Africa
Segment Reporting, Asset Reconciling Item [Line Items]
Total identifiable assets	490,867	511,037
Operating Segments | Australia & New Zealand
Segment Reporting, Asset Reconciling Item [Line Items]
Total identifiable assets	55,811	60,416
Corporate
Segment Reporting, Asset Reconciling Item [Line Items]
Total identifiable assets	$ 34,770	$ 51,421