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Long-Term Debt And Liquidity (Narrative) (Details) (USD $) | 0 Months Ended | 3 Months Ended |  |  | 0 Months Ended | 3 Months Ended | 0 Months Ended | 3 Months Ended |  |  |  |  |  | 0 Months Ended |  |  |
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Apr. 23, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Apr. 23, 2014 Minimum [Member] | Mar. 31, 2014 Minimum [Member] | Apr. 23, 2014 Maximum [Member] | Mar. 31, 2014 Maximum [Member] | Mar. 31, 2014 Senior Notes [Member] | Dec. 31, 2013 Senior Notes [Member] | Nov. 20, 2012 Senior Notes [Member] | Mar. 31, 2014 Senior Notes [Member] Minimum [Member] | Nov. 20, 2012 Senior Notes [Member] Maximum [Member] | Nov. 30, 2010 Senior Subordinated Notes [Member] | Mar. 31, 2014 Senior Subordinated Notes [Member] | Dec. 31, 2013 Senior Subordinated Notes [Member] | Sep. 30, 2013 Senior Subordinated Notes [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Fair Value |  | $ 566,400,000 | $ 549,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  | 554,512,000 | 541,593,000 |  |  |  |  |  | 300,000,000 | 300,000,000 |  |  |  |  | 178,672,000 | 175,675,000 |
Repurchase Percentage Price Of Aggregate Principal Due To Change In Control |  |  |  |  |  |  |  |  |  |  | 101.00% |  |  |  |  |  |
Interest rate description |  | LIBOR plus a margin ranging from 1.5% to 2.25% (depending on our total net leverage ratio and/or senior unsecured rating) or, in the case of dollar denominated loans, the alternate base rate plus a margin ranging from 0.50% to 1.25% (depending upon such ratio or rating). The alternate base rate is the highest of (i) the prime rate announced by JPMorgan Chase Bank, N.A., (ii) the federal fund effective rate plus one-half of 1.0% and (iii) the London interbank offering rate (as adjusted) for a one-month period plus 1.0%. GrafTech Finance, Luxembourg Holdco and Swissco pay a per annum fee ranging from 0.25% to 0.40% (depending on such ratio or rating) on the undrawn portion of the commitments under the Revolving Facility. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LIBOR plus margin percentage |  |  |  |  | 1.25% | 1.50% | 2.00% | 2.25% |  |  |  |  |  |  |  |  |
Alternate base rate plus margin percentage |  |  |  |  | 0.25% | 0.50% | 1.00% | 1.25% |  |  |  |  |  |  |  |  |
Addition to federal effective fund rate to determine base rate |  |  |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of one-month interest rate plus London interbank offering rate | 1.00% | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Per annum fee by GrafTech Finance and Swissco |  |  |  |  | 0.20% | 0.25% | 0.35% | 0.40% |  |  |  |  |  |  |  |  |
Financial covenants, minimum interest coverage ratio | 2.50 | 3.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial covenants, maximum net senior secured leverage ratio | 3.00 |  | 2.25 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt issued in connection with acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000,000 |  |  |
Debt instruments maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  | 2015 |  |  |
Senior Subordinated Notes interest rate |  | 7.00% |  |  |  |  |  |  |  |  |  |  |  | 7.00% |  |  |
Loan balance, net of unamortized discount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 175,700,000 |  | 178,700,000
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  | 300,000,000 |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 6.375% |  |  |  |  |  |  | 6.375% |  |  |  |  |  |
Redemption Price Percentage Of Principal Prior To November 15, 2016 |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |
Aggregate Principal Redemption Percentage Price Prior To November 15, 2015 |  |  |  |  |  |  |  |  |  |  |  |  | 35.00% |  |  |  |
Redemption Price Percentage Of Principal Prior To November 15, 2015 |  |  |  |  |  |  |  |  |  |  | 106.375% |  |  |  |  |  |
Unpaid Indebtness After Maturity Or Acceleration |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |  |  |  |
Unpaid Judgment Or Decree |  |  |  |  |  |  |  |  |  |  |  | $ 50,000,000 |  |  |  |  |

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