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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2017
Fair Value Disclosures [Abstract] |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] | The following table provides a reconciliation of the Level 3 earn-out liability measured at estimated fair value based on an initial valuation and updated quarterly for the year ended December 31, 2017 (in thousands):
|  | Earn-out Liability
Contingent earn-out liability, December 31, 2016 |  | $ | — |
Acquisition date fair value estimate of earn-out |  | 19,000 |
Change in fair value of contingent earn-out (included in income from operations as a separate line item) |  | 8,000 |
Contingent earn-out liability, December 31, 2017 |  | $ | 27,000 |
Fair Value Inputs, Liabilities, Quantitative Information [Table Text Block] | The following table provides quantitative information about Level 3 inputs for fair value measurement of our earn-out liability as of the acquisition date and December 31, 2017. Significant increases or decreases in these inputs in isolation could result in a significant impact on our fair value measurement:
Simulation Input |  | As of December 31, 2017 |  | At Acquisition February 3, 2017
Adjusted EBITDA Volatility |  | 26.00 | % |  | 29.00 | %
WACC |  | 8.75 | % |  | 10.00 | %
20-year risk free rate |  | 2.58 | % |  | 2.82 | %
Market price of risk |  | 5.99 | % |  | 6.93 | %
Cost of debt |  | 4.08 | % |  | 4.16 | %
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] | Our assets and liabilities measured at fair value on a recurring basis consisted of the following (Level 1, 2 and 3 inputs as defined above) (in thousands):
| Fair value measurements at December 31, 2017
| Total carrying value |  | Quoted prices in active markets for identical assets (level 1) |  | Significant other observable inputs (level 2) |  | Significant unobservable inputs (level 3)
Assets: |  |  |  |  |  |  |
Available for sale securities: |  |  |  |  |  |  |
Short-term | $ | 10,061 |  |  | $ | — |  |  | $ | 10,061 |  |  | $ | — |
Long-term | 14,579 |  |  | — |  |  | 14,579 |  |  | — |
Total Assets | $ | 24,640 |  |  | $ | — |  |  | $ | 24,640 |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |
Earn-out liability | $ | 27,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 27,000 |
Foreign exchange forwards: |  |  |  |  |  |  |
Accrued liabilities | 187 |  |  | — |  |  | 187 |  |  | — |
Other long-term liabilities | 402 |  |  | — |  |  | 402 |  |  | — |
Total Liabilities | $ | 27,589 |  |  | $ | — |  |  | $ | 589 |  |  | $ | 27,000 |
Fair Value Measurements, Nonrecurring [Table Text Block] | Our assets measured at fair value on a nonrecurring basis consisted of the following (Level 1, 2 and 3 inputs as defined above (in thousands):
| Fair value measurements at December 31, 2017 using
| Total carrying value |  | Quoted prices in active markets for identical assets (level 1) |  | Significant other observable inputs (level 2) |  | Significant unobservable inputs (level 3)
Assets: |  |  |  |  |  |  |
Assets held-for-sale | $ | 12,489 |  |  | $ | — |  |  | $ | — |  |  | $ | 12,489 |
Total Assets | $ | 12,489 |  |  | $ | — |  |  | $ | — |  |  | $ | 12,489 |

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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of quantitative information about the inputs used in the fair value measurement of liabilities. This disclosure may include, but is not limited to, the fair value of the liability, valuation technique used to measure fair value, the inputs used to measure fair value, the ranges of the inputs, and the weighted averages of the inputs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset) using recurring unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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