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Non current long-term debt including related party.

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Redemption Price, express as a percentage.

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Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount of the fee that accompanies borrowing money under the debt instrument.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of the required periodic payments applied to principal.

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The amount of debt premium that was originally recognized at the issuance of the instrument that has yet to be amortized.

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Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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No definition available.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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Debt (Long Term Debt) (Details) ¥ in Billions	1 Months Ended	12 Months Ended
Debt (Long Term Debt) (Details) ¥ in Billions	Jun. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2015 JPY (¥)	Dec. 31, 2015 USD ($)	Nov. 30, 2015 USD ($)	Jun. 01, 2015	May. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Nov. 30, 2012 USD ($)	Jun. 30, 2012 USD ($)
Debt Instrument [Line Items]
Long-term Debt Including Related Party, Gross				$ 1,590,655,000				$ 1,525,000,000
Debt Instrument, Unamortized Premium				5,222,000				5,824,000
Less: Short-term borrowings and current portion of long-term debt				(76,770,000)				(5,000,000)
Long-term debt (including related party)				1,519,107,000				1,525,824,000
$200 million revolving credit facility, LIBOR plus 1.25%-1.75%, due December 2019 (1) \| Revolving Credit Facility [Member] \| Line of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity				200,000,000
Long-term Debt Including Related Party, Gross				100,000,000				0
Line of Credit Facility, Current Borrowing Capacity				64,300,000
$200 million revolving credit facility, LIBOR plus 1.25%-1.75%, due December 2019 (1) \| Letter of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity				25,000,000
7.375% Senior notes, due May 2018 \| Senior notes (Level 1)
Debt Instrument [Line Items]
Repayments of Debt	$ 345,000,000
Long-term Debt Including Related Party, Gross				$ 0				345,000,000
Interest rate	7.375%		7.375%	7.375%
Redemption Price						101.844%
Debt Instrument, Fee Amount	$ 6,400,000
Unamortized Debt Issuance Expense	$ 2,500,000
Senior Notes Due June 2021 [Member] \| Senior notes (Level 1)
Debt Instrument [Line Items]
Long-term Debt Including Related Party, Gross				$ 400,000,000				400,000,000
6.375% Senior notes, due October 2022 \| Senior notes (Level 1)
Debt Instrument [Line Items]
Long-term Debt Including Related Party, Gross				$ 525,000,000				525,000,000
Interest rate			6.375%	6.375%
KOREA, REPUBLIC OF \| $41 million revolving credit facility, foreign currency funding-linked base rate plus 2.00%, due June 2016 \| Revolving Credit Facility [Member] \| Line of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity				$ 41,000,000.0						$ 41,000,000
Long-term Debt Including Related Party, Gross				40,000,000				0
Debt Instrument, Basis Spread on Variable Rate		1.60%
Line of Credit Facility, Current Borrowing Capacity				1,000,000
KOREA, REPUBLIC OF \| Term Loan Due May 2018 [Member] \| Subsidiary Term Loans [Member]
Debt Instrument [Line Items]
Long-term Debt Including Related Party, Gross				120,000,000				0
Debt Instrument, Basis Spread on Variable Rate		2.60%
Debt Instrument, Unused Borrowing Capacity, Amount							$ 120,000,000
KOREA, REPUBLIC OF \| Term loan, LIBOR plus 2.70%, due December 2019 \| Subsidiary Term Loans [Member]
Debt Instrument [Line Items]
Long-term Debt Including Related Party, Gross				70,000,000				70,000,000
Debt Instrument, Basis Spread on Variable Rate		2.70%
Debt Instrument, Unused Borrowing Capacity, Amount									$ 100,000,000
KOREA, REPUBLIC OF \| Term Loan Due May 2020 $150M [Member] \| Subsidiary Term Loans [Member]
Debt Instrument [Line Items]
Long-term Debt Including Related Party, Gross				150,000,000			150,000,000	0
Debt Instrument, Periodic Payment, Principal		$ 30,000,000
Debt Instrument, Basis Spread on Variable Rate		1.35%
KOREA, REPUBLIC OF \| Term Loan Due May 2020 $80M [Member] \| Subsidiary Term Loans [Member]
Debt Instrument [Line Items]
Long-term Debt Including Related Party, Gross				80,000,000			80,000,000	0
Debt Instrument, Periodic Payment, Principal		$ 10,000,000
Debt Instrument, Basis Spread on Variable Rate		1.35%
KOREA, REPUBLIC OF \| Term Loan Due June 2020 [Member] \| Subsidiary Term Loans [Member]
Debt Instrument [Line Items]
Long-term Debt Including Related Party, Gross				40,000,000				0
Debt Instrument, Basis Spread on Variable Rate		1.60%
Debt Instrument, Unused Borrowing Capacity, Amount				110,000,000			$ 150,000,000
KOREA, REPUBLIC OF \| Term loan, LIBOR plus 3.70%, due June 2016 (4) \| Subsidiary Term Loans [Member]
Debt Instrument [Line Items]
Long-term Debt Including Related Party, Gross				0				70,000,000
Debt Instrument, Basis Spread on Variable Rate		3.70%
KOREA, REPUBLIC OF \| Term loan, foreign currency funding-linked base rate plus 2.00%, due March 2017 (5) \| Subsidiary Term Loans [Member]
Debt Instrument [Line Items]
Long-term Debt Including Related Party, Gross				0				80,000,000
Debt Instrument, Basis Spread on Variable Rate		1.80%
KOREA, REPUBLIC OF \| Term loan, LIBOR plus 3.70%, due July 2017 (6) \| Subsidiary Term Loans [Member]
Debt Instrument [Line Items]
Long-term Debt Including Related Party, Gross				0				30,000,000
Debt Instrument, Basis Spread on Variable Rate		3.70%
KOREA, REPUBLIC OF \| Term loan, foreign currency funding-linked base rate plus 1.75%, due September 2017 (7) \| Subsidiary Term Loans [Member]
Debt Instrument [Line Items]
Long-term Debt Including Related Party, Gross				0				5,000,000
Debt Instrument, Basis Spread on Variable Rate		1.75%
TAIWAN, PROVINCE OF CHINA \| Revolving credit facility, TAIFX plus a bank-determined spread, due November 2020 (Taiwan) [Member] \| Revolving Credit Facility [Member] \| Line of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity					$ 39,000,000
Long-term Debt Including Related Party, Gross				10,000,000				0
Line of Credit Facility, Current Borrowing Capacity				29,000,000
JAPAN \| Short term revolving credit facility, variable rate [Member] \| Revolving Credit Facility [Member] \| Line of Credit [Member]
Debt Instrument [Line Items]
Long-term Debt Including Related Party, Gross				15,582,000				0
JAPAN \| Short term revolving credit facility, fixed rate [Member] \| Revolving Credit Facility [Member] \| Line of Credit [Member]
Debt Instrument [Line Items]
Long-term Debt Including Related Party, Gross				$ 5,808,000				0
Interest rate			0.50%	0.50%
JAPAN \| Term Loan Due June and November 2016 [Member] \| Subsidiary Term Loans [Member]
Debt Instrument [Line Items]
Long-term Debt Including Related Party, Gross			¥ 0.3	$ 2,800,000				0
Debt Instrument, Basis Spread on Variable Rate		1.00%
JAPAN \| Term Loan Due April 2018 [Member] \| Subsidiary Term Loans [Member]
Debt Instrument [Line Items]
Long-term Debt Including Related Party, Gross			¥ 3.8	$ 31,465,000				$ 0
Interest rate			0.53%	0.53%