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Commitments & Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract] |
Commitments for Minimum Lease Payments Under Non Cancelable Operating Leases | Commitments for minimum lease payments under non-cancelable operating and capital leases as of December 31, 2017 are as follows (in thousands):
| Operating Leases |  | Capital Leases
2018 | $ | 8,538 |  |  | $ | 230 |
2019 | 8,437 |  |  | 71 |
2020 | 7,409 |  |  | 14 |
2021 | 6,458 |  |  | 7 |
2022 | 6,220 |  |  | 4 |
Thereafter | 17,206 |  |  | — |
| $ | 54,268 |  |  | $ | 326 |
Future Purchase Commitments | Future purchase commitments as of December 31, 2017, are as follows (in thousands):
2018 | $ | 39,338 |
2019 | 18,841 |
2020 | 8,519 |
2021 | 4,093 |
2022 | 1,668 |
| $ | 72,459 |

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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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- Definition Tabular disclosure of unconditional purchase obligations that are not recognized as a liability on the balance sheet, including the nature and significant terms of an unconditional purchase obligation; the amount of the fixed and determinable portion of the obligation as of the date of the latest balance sheet presented in the aggregate and, if determinable, for each of the five succeeding fiscal years; the nature of any variable components of the obligation; the amount purchased under the obligation (for example, the take-or-pay or throughput contract) for the reporting period; and may include the amount of imputed interest necessary to reduce the obligation to present value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=73718637&loc=d3e25287-109308 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=73718637&loc=d3e25336-109308 + Details
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