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Commitments and Contingencies Commitments and Contingencies (Tables) | 9 Months Ended
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Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract] |
Contractual Obligation, Fiscal Year Maturity Schedule [Table Text Block] | The following table summarizes our principal contractual commitments, excluding open orders for purchases that support normal operations, as of September 30, 2017 (in thousands):
| Payments Due By Period
| Total |  | Remainder of 2017 |  | 2018 |  | 2019 |  | 2020 |  | 2021 |  | Thereafter
Long-term debt obligations | $ | 75,000 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 75,000 |  |  | $ | — |  |  | $ | — |
Interest payments on long-term debt obligations | 7,475 |  |  | 763 |  |  | 3,198 |  |  | 3,215 |  |  | 299 |  |  | — |  |  | — |
Operating lease obligations | 33,763 |  |  | 2,638 |  |  | 9,208 |  |  | 5,769 |  |  | 3,378 |  |  | 3,219 |  |  | 9,551 |
Purchase obligations(1) | 97,970 |  |  | 5,513 |  |  | 4,477 |  |  | 14,005 |  |  | 34,757 |  |  | 39,218 |  |  | — |
Total contractual obligations | $ | 214,208 |  |  | $ | 8,914 |  |  | $ | 16,883 |  |  | $ | 22,989 |  |  | $ | 113,434 |  |  | $ | 42,437 |  |  | $ | 9,551 |
___________________________________ (1) Purchase obligations includes agreements to purchase goods that are enforceable and legally binding. These amounts are not accrued as of September 30, 2017.

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- Definition Tabular disclosure of the aggregate amount of payments due on known contractual obligations for the five years following the date of the latest balance sheet and the combined aggregate amount of maturities of known contractual obligations. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 303 -Paragraph a -Subparagraph 5 + Details
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