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Restructuring Charges (Tables) | 12 Months Ended
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Dec. 31, 2018
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 |  |  | Other Restructurings |  |  |  |  |
(in thousands) |  | Severance & Employee Benefits |  |  | Facilities |  |  | Severance & Employee Benefits |  |  | Total |
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 |
Restructuring charges |  |  | 442 |  |  |  | 265 |  |  |  | 297 |  |  |  | 1,004 |
Cash payments |  |  | (1,165 | ) |  |  | (550 | ) |  |  | (538 | ) |  |  | (2,253 | )
Adjustment to liability |  |  | — |  |  |  | — |  |  |  | 16 |  |  |  | 16 |
Balance at December 31, 2017 |  |  | 1,551 |  |  |  | 807 |  |  |  | 191 |  |  |  | 2,549 |
Restructuring charges |  |  | 1,457 |  |  |  | — |  |  |  | 130 |  |  |  | 1,587 |
Cash payments |  |  | (1,379 | ) |  |  | (156 | ) |  |  | (181 | ) |  |  | (1,716 | )
Adjustment to liability |  |  | 410 |  |  |  | (451 | ) |  |  | (128 | ) |  |  | (169 | )
Balance at December 31, 2018 |  | $ | 2,039 |  |  | $ | 200 |  |  | $ | 12 |  |  | $ | 2,251 |

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- Definition Tabular disclosure of costs incurred for restructuring including, but not limited to, exit and disposal activities, remediation, implementation, integration, asset impairment, and charges against earnings from the write-down of assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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