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Revenue From Contracts With Customers (Tables) | 12 Months Ended
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Dec. 31, 2018
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | The following table provides information about disaggregated revenue by type of product and contract for 2018:
| For the Year Ended December 31, 2018
| (Dollars in thousands)
Graphite Electrodes - Three-to-five-year contracts | $ | 1,341,557 |
Graphite Electrodes - Short-term contracts | 500,834 |
By-products | 53,519 |
Total Revenues | $ | 1,895,910 |
Contract with Customer, Asset and Liability | Current deferred revenue is included in "Other accrued liabilities" and long-term deferred revenue is included in "Other long-term obligations" on the Consolidated Balance Sheets. The following table provides information about deferred revenue from contracts with customers (in thousands):
| Current deferred revenue |  | Long-Term deferred revenue
| (Dollars in thousands)
Balance as of December 31, 2017 | $ | 20,784 |  |  | $ | — |
Increases due to billings | 15,548 |  |  | 8,241 |
Revenue recognized | (30,803 | ) |  | — |
Foreign currency impact | (149 | ) |  | (525 | )
Balance as of December 31, 2018 | $ | 5,380 |  |  | $ | 7,716 |
Remaining Performance Obligation, Expected Timing of Satisfaction\ | The following table presents estimated revenues expected to be recognized in the future related to performance obligations that are unsatisfied (or partially unsatisfied) at the end of the reporting period (in thousands). The estimated revenues do not include contracts with original duration of one year or less.
| Three-to-five-year take-or-pay contracts
| (Dollars in thousands) |
2019 | $ | 1,404,618 |
2020 | 1,327,449 |
2021 | 1,172,536 |
2022 | 1,127,105 |
Thereafter | 8,715 |
Total | $ | 5,040,423 |

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130551-203045 + Details
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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- Definition Tabular disclosure of expected timing for satisfying remaining performance obligation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130556-203045 + Details
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