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Derivative Interest rate swap contract List (Details) - 12 months ended Dec. 31, 2017 $ in Thousands, ₩ in Millions		KRW (₩)	USD ($)
Not Designated as Hedging Instrument [Member] | Interest rate swap contracts 1 [Member]
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		JP Morgan
Derivative, Term of Contract		2013~2018
Contract Interest rate Pay		3.58%
Contract Interest rate Receive		3M CD+0.31%
Contract amount | ₩		₩ 150,000
Not Designated as Hedging Instrument [Member] | Interest rate swap contracts 2 [Member]
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		Credit Suisse
Derivative, Term of Contract		2014~2018
Contract Interest rate Pay		2.98%
Contract Interest rate Receive		1Y CMT+0.31%
Contract amount | ₩		₩ 25,000
Not Designated as Hedging Instrument [Member] | Interest rate swap contracts 3 [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] | Interest rate swap contracts 4 [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] | Interest rate swap contracts 5 [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] | Interest rate swap contracts 6 [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] | Interest rate swap contracts 7 [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] | Interest rate swap contracts 8 [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] | Interest rate swap contracts 9 [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] | Interest rate swap contracts 1 [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] | Interest rate swap contracts 2 [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] | Interest rate swap contracts 3 [Member]
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		Credit Agricole
Derivative, Term of Contract		2016~2033
Contract Interest rate Pay		3.98% ~ 4.10%
Contract Interest rate Receive		6M USD Libor
Contract amount			96,297
Designated as Hedging Instrument [Member] | Interest rate swap contracts 4 [Member]
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		SMBC
Derivative, Term of Contract		2016~2033
Contract Interest rate Pay		4.05% ~ 4.18%
Contract Interest rate Receive		6M USD Libor
Contract amount			125,927
Designated as Hedging Instrument [Member] | Interest rate swap contracts 5 [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		1.35%
Contract amount			36,890
Designated as Hedging Instrument [Member] | Interest rate swap contracts 6 [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		1.35%
Contract amount			$ 36,890
[1] 2.05% of the contract interest rate for paying is applied for five years from the date of issuance, and 3M CD + 0.10% is applied thereafter.

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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

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-Publisher SEC
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