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Pension and Postretirement Benefits - Components of Net Periodic Benefit Cost and Other Amounts Recognized in Other Comprehensive Income (Loss) of Viad's Postretirement Benefit Plans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Foreign Pension Plans |  |  |
Net periodic benefit cost: |  |  |
Service cost | $ 530 | $ 488 | $ 503
Interest cost | 492 | 488 | 505
Expected return on plan assets | (602) | (558) | (583)
Recognized net actuarial loss | 155 | 162 | 160
Settlement | 777 |  |
Net periodic benefit cost | 1,352 | 580 | 585
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss): |  |  |
Net actuarial loss (gain) | (106) | 158 | 182
Reversal of amortization item: |  |  |
Net actuarial loss | (155) | (162) | (160)
Total recognized in other comprehensive income (loss) | (261) | (4) | 22
Total recognized in net periodic benefit cost and other comprehensive income (loss) | 1,091 | 576 | 607
Pension Plans | Domestic Plans |  |  |
Net periodic benefit cost: |  |  |
Service cost | 64 | 98 | 101
Interest cost | 803 | 1,032 | 1,018
Expected return on plan assets | (176) | (256) | (380)
Recognized net actuarial loss | 433 | 423 | 492
Net periodic benefit cost | 1,124 | 1,297 | 1,231
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss): |  |  |
Net actuarial loss (gain) | 114 | 1 | (963)
Reversal of amortization item: |  |  |
Net actuarial loss | (433) | (423) | (492)
Total recognized in other comprehensive income (loss) | (319) | (422) | (1,455)
Total recognized in net periodic benefit cost and other comprehensive income (loss) | 805 | 875 | (224)
Postretirement Benefit Plans | Domestic Plans |  |  |
Net periodic benefit cost: |  |  |
Service cost | 92 | 99 | 152
Interest cost | 413 | 573 | 619
Amortization of prior service credit | (431) | (503) | (552)
Recognized net actuarial loss | 164 | 295 | 528
Net periodic benefit cost | 238 | 464 | 747
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss): |  |  |
Net actuarial loss (gain) | 237 | (790) | (1,248)
Prior service credit | 816 | 73 | 3
Reversal of amortization item: |  |  |
Net actuarial loss | (164) | (295) | (528)
Prior service credit | 431 | 503 | 552
Total recognized in other comprehensive income (loss) | 1,320 | (509) | (1,221)
Total recognized in net periodic benefit cost and other comprehensive income (loss) | $ 1,558 | $ (45) | $ (474)

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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive income from prior service cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount, before tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e689-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 + Details
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