Revenues - Location of Customer (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 1,862,716	$ 2,131,278	$ 2,165,702
Enterprise Solutions
Disaggregation of Revenue [Line Items]
Revenues	872,417	946,041	957,501
Industrial Solutions
Disaggregation of Revenue [Line Items]
Revenues	990,299	1,185,237	1,208,201
Americas
Disaggregation of Revenue [Line Items]
Revenues	1,214,421	1,437,571	1,458,664
Americas | Enterprise Solutions
Disaggregation of Revenue [Line Items]
Revenues	636,492	695,008	700,499
Americas | Industrial Solutions
Disaggregation of Revenue [Line Items]
Revenues	577,929	742,563	758,165
EMEA
Disaggregation of Revenue [Line Items]
Revenues	387,655	409,762	425,779
EMEA | Enterprise Solutions
Disaggregation of Revenue [Line Items]
Revenues	130,982	135,732	135,217
EMEA | Industrial Solutions
Disaggregation of Revenue [Line Items]
Revenues	256,673	274,030	290,562
APAC
Disaggregation of Revenue [Line Items]
Revenues	260,640	283,945	281,259
APAC | Enterprise Solutions
Disaggregation of Revenue [Line Items]
Revenues	104,943	115,301	121,785
APAC | Industrial Solutions
Disaggregation of Revenue [Line Items]
Revenues	$ 155,697	$ 168,644	$ 159,474