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Restructuring Charges - Changes to Restructuring Liability by Major Restructuring Activity (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | $ 3,782 |  |  |  | $ 2,276 | $ 3,782 | $ 2,276 | $ 1,944
Restructuring charges | $ 187 | $ 255 | $ 168 | 394 | $ 1,519 | $ 1,697 | $ 975 | 992 | 1,004 | 5,183 | 2,956
Cash payments |  |  |  |  |  |  |  |  | (2,253) | (3,866) | (2,572)
Adjustment to liability |  |  |  |  |  |  |  |  | 16 | 189 | (52)
Ending balance | 2,549 |  |  |  | 3,782 |  |  |  | 2,549 | 3,782 | 2,276
GES Consolidation | Severance & Employee Benefits |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 2,274 |  |  |  | 751 | 2,274 | 751 | 543
Restructuring charges |  |  |  |  |  |  |  |  | 442 | 3,693 | 1,767
Cash payments |  |  |  |  |  |  |  |  | (1,165) | (2,170) | (1,514)
Adjustment to liability |  |  |  |  |  |  |  |  |  |  | (45)
Ending balance | 1,551 |  |  |  | 2,274 |  |  |  | 1,551 | 2,274 | 751
GES Consolidation | Facilities |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 1,092 |  |  |  | 1,291 | 1,092 | 1,291 | 1,161
Restructuring charges |  |  |  |  |  |  |  |  | 265 | 759 | 587
Cash payments |  |  |  |  |  |  |  |  | (550) | (1,150) | (457)
Adjustment to liability |  |  |  |  |  |  |  |  |  | 192 |
Ending balance | 807 |  |  |  | 1,092 |  |  |  | 807 | 1,092 | 1,291
Other Restructuring | Severance & Employee Benefits |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | $ 416 |  |  |  | $ 234 | 416 | 234 | 240
Restructuring charges |  |  |  |  |  |  |  |  | 297 | 731 | 602
Cash payments |  |  |  |  |  |  |  |  | (538) | (546) | (601)
Adjustment to liability |  |  |  |  |  |  |  |  | 16 | (3) | (7)
Ending balance | $ 191 |  |  |  | $ 416 |  |  |  | $ 191 | $ 416 | $ 234

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