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Restructuring Charges - Changes to Restructuring Liability by Major Restructuring Activity (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Restructuring Cost And Reserve [Line Items]
Beginning balance			$ 2,549
Restructuring charges	$ 175	$ 255	999	$ 817
Cash payments			(1,330)
Adjustment to liability			(141)
Ending balance	2,077		2,077
GES \| Severance & Employee Benefits
Restructuring Cost And Reserve [Line Items]
Beginning balance			1,551
Restructuring charges			869
Cash payments			(1,052)
Adjustment to liability			438
Ending balance	1,806		1,806
GES \| Facilities
Restructuring Cost And Reserve [Line Items]
Beginning balance			807
Cash payments			(97)
Adjustment to liability			(451)
Ending balance	259		259
Other Restructuring \| Severance & Employee Benefits
Restructuring Cost And Reserve [Line Items]
Beginning balance			191
Restructuring charges			130
Cash payments			(181)
Adjustment to liability			(128)
Ending balance	$ 12		$ 12