Segment Information - Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Segment Reporting, Asset Reconciling Item [Line Items]
Total identifiable assets	$ 2,035,032	$ 1,364,696
North America Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Total identifiable assets	1,181,446	956,807
Europe & Africa Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Total identifiable assets	535,520	363,857
Australia & New Zealand Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Total identifiable assets	300,255
Corporate Segment [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total identifiable assets	$ 17,811	$ 44,032