Restructuring Charges (Tables)

12 Months Ended

Dec. 31, 2016

Restructuring And Related Activities [Abstract]

Changes to Restructuring Liability by Major Restructuring Activity

Changes to the restructuring liability by major restructuring activity are as follows:

	GES Consolidation						Other Restructurings
(in thousands)	Severance & Employee Benefits			Facilities			Severance & Employee Benefits			Total
Balance at December 31, 2013	$	1,240		$	3,565		$	893		$	5,698
Restructuring charges (recoveries)		2,358			(828	)		107			1,637
Cash payments		(3,055	)		(1,376	)		(845	)		(5,276	)
Adjustment to liability		—			(200	)		85			(115	)
Balance at December 31, 2014		543			1,161			240			1,944
Restructuring charges		1,767			587			602			2,956
Cash payments		(1,514	)		(457	)		(601	)		(2,572	)
Adjustment to liability		(45	)		—			(7	)		(52	)
Balance at December 31, 2015		751			1,291			234			2,276
Restructuring charges		3,693			759			731			5,183
Cash payments		(2,170	)		(1,150	)		(546	)		(3,866	)
Adjustment to liability		—			192			(3	)		189
Balance at December 31, 2016	$	2,274		$	1,092		$	416		$	3,782