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Commitment and Contingencies Disclosure (Tables) | 12 Months Ended
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Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract] |
Operating leases | The amounts of annual minimum lease payments due under these leases as of December 31, 2017, were:
| 2018 |  | 2019 |  | 2020 |  | 2021 |  | 2022 |  | Thereafter |
| (In thousands)
Operating leases | $ | 55,511 |  | $ | 45,307 |  | $ | 33,168 |  | $ | 18,562 |  | $ | 7,047 |  | $ | 40,833 |
Purchase commitments | The commitments under these contracts as of December 31, 2017, were:
| 2018 |  | 2019 |  | 2020 |  | 2021 |  | 2022 |  | Thereafter |
| (In thousands)
Purchase commitments | $ | 360,751 |  | $ | 215,005 |  | $ | 162,424 |  | $ | 135,334 |  | $ | 99,068 |  | $ | 773,820 |

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- Definition Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 + Details
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- Definition Tabular disclosure of key provisions of an arrangement under which the entity has agreed to purchase goods or services over a period of time greater than one year or the normal operating cycle, if longer, including the item for which expenditures will be made, minimum quantities, milestones, time period and committed amount. + References No definition available. + Details
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