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Debt (Tables) | 12 Months Ended
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Dec. 31, 2017
Debt Disclosure [Abstract] |
Schedule of Debt [Table Text Block] | The components of our borrowings are as follows:
| December 31, 2017 |  | December 31, 2016
| (in thousands)
Credit Facilities |  |  |
USD denominated term loan | $ | 194,063 |  |  | $ | 208,125 |
Multicurrency revolving line of credit | 125,414 |  |  | 97,167 |
Senior notes | 300,000 |  |  | — |
Total debt | 619,477 |  |  | 305,292 |
Less: current portion of debt | 19,688 |  |  | 14,063 |
Less: unamortized prepaid debt fees - term loan | 629 |  |  | 769 |
Less: unamortized prepaid debt fees - senior notes | 5,588 |  |  | — |
Long-term debt | $ | 593,572 |  |  | $ | 290,460 |
Schedule of Maturities of Long-term Debt [Table Text Block] | Required minimum principal payments on our outstanding credit facilities are as follows:
Year Ending December 31, |  | Minimum Payments
|  | (in thousands)
2018 |  | $ | 19,688 |
2019 |  | 22,500 |
2020 |  | 277,289 |
2021 |  | — |
2022 |  | — |
Total minimum payments on debt |  | $ | 319,477 |
Schedule of Long-Term Debt Repayments [Table Text Block] | Total credit facility repayments were as follows:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
| (in thousands)
Term loan | $ | 14,063 |  |  | $ | 11,250 |  |  | $ | 13,125 |
Multicurrency revolving line of credit | 15,000 |  |  | 67,869 |  |  | 49,873 |
Total credit facility repayments | $ | 29,063 |  |  | $ | 79,119 |  |  | $ | 62,998 |

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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