Revenues - Major Product Category (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
Broadband and 5G
Disaggregation of Revenue [Line Items]
Revenues	432,262	401,415	389,246
Broadband and 5G | Enterprise Solutions
Disaggregation of Revenue [Line Items]
Revenues	432,262	401,415	389,246
Broadband and 5G | Industrial Solutions
Disaggregation of Revenue [Line Items]
Revenues	0	0	0
Cyber-Security
Disaggregation of Revenue [Line Items]
Revenues	110,524	133,039	136,648
Cyber-Security | Enterprise Solutions
Disaggregation of Revenue [Line Items]
Revenues	0	0	0
Cyber-Security | Industrial Solutions
Disaggregation of Revenue [Line Items]
Revenues	110,524	133,039	136,648
Industrial Automation
Disaggregation of Revenue [Line Items]
Revenues	879,775	1,052,198	1,071,553
Industrial Automation | Enterprise Solutions
Disaggregation of Revenue [Line Items]
Revenues	0	0	0
Industrial Automation | Industrial Solutions
Disaggregation of Revenue [Line Items]
Revenues	879,775	1,052,198	1,071,553
Smart Buildings
Disaggregation of Revenue [Line Items]
Revenues	440,155	544,626	568,255
Smart Buildings | Enterprise Solutions
Disaggregation of Revenue [Line Items]
Revenues	440,155	544,626	568,255
Smart Buildings | Industrial Solutions
Disaggregation of Revenue [Line Items]
Revenues	$ 0	$ 0	$ 0