Charges Related To Restructuring Activities Narrative (Details) - USD ($)	3 Months Ended			6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Restructuring Cost and Reserve [Line Items]
Charges	$ 1,685,000	$ 1,392,000	$ 1,321,000	$ 3,077,000	$ 2,013,000
Restructuring and Related Activities, Expected Payout Period				12 months
Payments	(2,216,000)	(1,870,000)		$ (4,086,000)	(2,113,000)
Severance
Restructuring Cost and Reserve [Line Items]
Charges	1,412,000	1,319,000
Payments	(1,943,000)	(1,797,000)
Contract Termination
Restructuring Cost and Reserve [Line Items]
Charges	273,000	73,000
Payments	(273,000)	(73,000)
North America
Restructuring Cost and Reserve [Line Items]
Charges	28,000	691,000	655,000	719,000	1,208,000
Restructuring Reserve, Accrual Adjustment	28,000			719,000
Payments	(265,000)	(562,000)
North America | Severance
Restructuring Cost and Reserve [Line Items]
Charges	28,000	691,000			1,164,000
Payments	(265,000)	(562,000)
North America | Contract Termination
Restructuring Cost and Reserve [Line Items]
Charges					44,000
Restructuring Reserve, Accrual Adjustment	0	0
Payments	0	0
Europe
Restructuring Cost and Reserve [Line Items]
Charges	1,575,000	665,000	320,000	2,240,000	640,000
Payments	(1,869,000)	(1,032,000)
Europe | Severance
Restructuring Cost and Reserve [Line Items]
Charges	1,302,000	592,000			640,000
Payments	(1,596,000)	(959,000)
Europe | Contract Termination
Restructuring Cost and Reserve [Line Items]
Charges	273,000	73,000
Payments	(273,000)	(73,000)
All Other
Restructuring Cost and Reserve [Line Items]
Charges	82,000	36,000	$ 346,000	$ 118,000	165,000
Payments	(82,000)	(276,000)
All Other | Severance
Restructuring Cost and Reserve [Line Items]
Charges	82,000	36,000			$ 165,000
Payments	(82,000)	(276,000)
All Other | Contract Termination
Restructuring Cost and Reserve [Line Items]
Charges	0	0
Payments	$ 0	$ 0