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Fair Value Measurements - Summary of Financial Liability Measured at Fair Value on a Recurring Basis (Details) - Designated As Hedging - Cash Flow Hedge - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Interest rate swap |  |  |
Recurring financial liability that was measured at carrying value |  |  |
Realized gain (loss) on cash flow hedge | $ (170) | $ 0 |
Derivative Asset | 1,359 | 971 | $ 753
Foreign currency hedges |  |  |
Recurring financial liability that was measured at carrying value |  |  |
Derivative liability |  | 742 | $ 601
Realized gain (loss) on cash flow hedge | 97 | 38 |
Derivative Asset | 76 |  |
Recurring | Significant Other Observable Inputs (Level 2) | Interest rate swap |  |  |
Recurring financial liability that was measured at carrying value |  |  |
Derivative liability | (1,359) | (971) |
Recurring | Significant Other Observable Inputs (Level 2) | Foreign currency hedges |  |  |
Recurring financial liability that was measured at carrying value |  |  |
Derivative liability |  | 742 |
Derivative Asset | 76 |  |
Recurring | Carrying Value | Interest rate swap |  |  |
Recurring financial liability that was measured at carrying value |  |  |
Derivative liability | (1,359) | (971) |
Recurring | Carrying Value | Foreign currency hedges |  |  |
Recurring financial liability that was measured at carrying value |  |  |
Derivative liability |  | $ 742 |
Derivative Asset | $ 76 |  |

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313 + Details
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