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Derivative Interest rate swap contract List (Details) - 12 months ended Dec. 31, 2018 - Interest rate swap contracts $ in Thousands, ₩ in Millions | KRW (₩) | USD ($)
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Not Designated as Hedging Instrument [Member] |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |
Counterparty |  | KEB Hana Bank |
Derivative, Term of Contract |  | 2017~2022 |
Contract Interest rate Pay |  | 2.01% |
Contract Interest rate Receive |  | 3M CD+0.24% |
Contract amount | ₩ |  | ₩ 100,000 |
Not Designated as Hedging Instrument [Member] |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |
Counterparty |  | KEB Hana Bank |
Derivative, Term of Contract |  | 2017~2022 |
Contract Interest rate Pay |  | 2.06% |
Contract Interest rate Receive |  | 3M CD+0.27% |
Contract amount | ₩ |  | ₩ 100,000 |
Not Designated as Hedging Instrument [Member] |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |
Counterparty | [1] | Nomura |
Derivative, Term of Contract | [1] | 2017~2037 |
Contract Interest rate Pay | [1] | 2.05% |
Contract Interest rate Receive | [1] | 3.08% |
Contract amount | ₩ | [1] | ₩ 30,000 |
Not Designated as Hedging Instrument [Member] |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |
Counterparty |  | KEB Hana Bank |
Derivative, Term of Contract |  | 2017~2021 |
Contract Interest rate Pay |  | 2.45% |
Contract Interest rate Receive |  | 3M CD+0.32% |
Contract amount | ₩ |  | ₩ 200,000 |
Not Designated as Hedging Instrument [Member] |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |
Counterparty | [2] | Nomura |
Derivative, Term of Contract | [2] | 2018~2038 |
Contract Interest rate Pay | [2] | 2.56% |
Contract Interest rate Receive | [2] | 3.75% |
Contract amount | ₩ | [2] | ₩ 30,000 |
Not Designated as Hedging Instrument [Member] |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |
Counterparty |  | KEB Hana Bank |
Derivative, Term of Contract |  | 2018~2023 |
Contract Interest rate Pay |  | 2.15% |
Contract Interest rate Receive |  | 3M CD+0.19% |
Contract amount | ₩ |  | ₩ 200,000 |
Not Designated as Hedging Instrument [Member] |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |
Counterparty |  | KEB Hana Bank |
Derivative, Term of Contract |  | 2018~2023 |
Contract Interest rate Pay |  | 2.17% |
Contract Interest rate Receive |  | 3M CD+0.19% |
Contract amount | ₩ |  | ₩ 200,000 |
Not Designated as Hedging Instrument [Member] |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |
Counterparty |  | KEB Hana Bank |
Derivative, Term of Contract |  | 2018~2023 |
Contract Interest rate Pay |  | 2.03% |
Contract Interest rate Receive |  | 3M CD+0.21% |
Contract amount | ₩ |  | ₩ 150,000 |
Not Designated as Hedging Instrument [Member] |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |
Counterparty |  | Societe Generale |
Derivative, Term of Contract |  | 2017~2022 |
Contract Interest rate Pay |  | 3M Libor+3.44% |
Contract Interest rate Receive |  | 3.77% |
Contract amount | ₩ |  | ₩ 200,000 |
Not Designated as Hedging Instrument [Member] |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |
Counterparty |  | Export-import bank of Korea |
Derivative, Term of Contract |  | 2015~2031 |
Contract Interest rate Pay |  | 2.67% |
Contract Interest rate Receive |  | 6M USD Libor |
Contract amount |  |  | $ 15,893
Not Designated as Hedging Instrument [Member] |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |
Counterparty |  | ING Bank |
Derivative, Term of Contract |  | 2015~2031 |
Contract Interest rate Pay |  | 2.67% |
Contract Interest rate Receive |  | 6M USD Libor |
Contract amount |  |  | 7,861
Not Designated as Hedging Instrument [Member] |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |
Counterparty |  | BNP Paribas |
Derivative, Term of Contract |  | 2015~2031 |
Contract Interest rate Pay |  | 2.67% |
Contract Interest rate Receive |  | 6M USD Libor |
Contract amount |  |  | 7,861
Designated as Hedging Instrument [Member] |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |
Counterparty |  | BNP Paribas |
Derivative, Term of Contract |  | 2009~2027 |
Contract Interest rate Pay |  | 4.16% |
Contract Interest rate Receive |  | 6M USD Libor |
Contract amount |  |  | 92,120
Designated as Hedging Instrument [Member] |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |
Counterparty |  | KFW |
Derivative, Term of Contract |  | 2009~2027 |
Contract Interest rate Pay |  | 4.16% |
Contract Interest rate Receive |  | 6M USD Libor |
Contract amount |  |  | 92,120
Designated as Hedging Instrument [Member] |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |
Counterparty |  | Credit Agricole |
Derivative, Term of Contract |  | 2018~2033 |
Contract Interest rate Pay |  | 3.98%~4.10% |
Contract Interest rate Receive |  | 6M USD Libor |
Contract amount |  |  | 92,686
Designated as Hedging Instrument [Member] |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |
Counterparty |  | SMBC |
Derivative, Term of Contract |  | 2018~2033 |
Contract Interest rate Pay |  | 4.05%~4.18% |
Contract Interest rate Receive |  | 6M USD Libor |
Contract amount |  |  | 121,205
Designated as Hedging Instrument [Member] |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |
Counterparty |  | Mizuho Bank |
Derivative, Term of Contract |  | 2016~2019 |
Contract Interest rate Pay |  | 1.56% |
Contract Interest rate Receive |  | 1.65% |
Contract amount |  |  | 36,890
Designated as Hedging Instrument [Member] |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |
Counterparty |  | SMBC |
Derivative, Term of Contract |  | 2016~2019 |
Contract Interest rate Pay |  | 1.56% |
Contract Interest rate Receive |  | 1.65% |
Contract amount |  |  | 36,890
Designated as Hedging Instrument [Member] |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |
Counterparty |  | Export-import bank of Korea |
Derivative, Term of Contract |  | 2016~2036 |
Contract Interest rate Pay |  | 3.00% |
Contract Interest rate Receive |  | 4.99% |
Contract amount |  |  | $ 2,564
[1] | 2.05% of the contract paying interest rate is applied for five years from the date of issuance, and 3M CD+0.10% is applied thereafter.
[2] | 2.56% of the contract paying interest rate is applied for five years from the date of issuance, and 3M CD+0.10% is applied thereafter.

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- Definition Identification of the name or type of counterparty to the derivative instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column A -Footnote 1 + Details
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