Operating Segments and Geographic Information - Reconciliations of Other Segment Measures to Consolidated Totals (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total segment assets	$ 3,406,759	$ 3,779,321	$ 3,840,613
Cash and cash equivalents	407,480	407,454	541,350
Goodwill	1,243,669	1,206,877	1,208,587
Intangible assets, less accumulated amortization	339,505	359,931	424,932
Deferred income taxes	25,216	26,459	28,517
Payments to Acquire Property, Plant, and Equipment From Continuing Operations	80,588	75,166	49,434
Reportable Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total segment assets	991,607	938,971	938,112
Payments to Acquire Property, Plant, and Equipment From Continuing Operations	77,478	72,153	47,932
Corporate assets
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total segment assets	24,147	16,786	60,865
Assets of discontinued operations	375,135	822,843	638,250
Payments to Acquire Property, Plant, and Equipment From Continuing Operations	$ 3,110	$ 3,013	$ 1,502