Debt (Interest Rates) (Details) (KOREA, REPUBLIC OF, Subsidiary Term Loans [Member])	Dec. 31, 2014	Dec. 31, 2013
London Interbank Offered Rate (LIBOR) [Member] | Term loan, LIBOR plus 3.70%, due June 2016
Debt Instrument [Line Items]
Debt Instrument, Interest Rate at Period End	3.96%	3.95%
London Interbank Offered Rate (LIBOR) [Member] | Term loan, LIBOR plus 3.70%, due July 2017
Debt Instrument [Line Items]
Debt Instrument, Interest Rate at Period End	3.93%	4.14%
London Interbank Offered Rate (LIBOR) [Member] | Term loan, LIBOR plus 3.70%, due December 2019
Debt Instrument [Line Items]
Debt Instrument, Interest Rate at Period End	3.93%	3.95%
Foreign Currency Funding-Linked Rate [Member] | Term loan, foreign currency funding-linked base rate plus 2.00%, due March 2017
Debt Instrument [Line Items]
Debt Instrument, Interest Rate at Period End	3.49%	0.00%
Foreign Currency Funding-Linked Rate [Member] | Term loan, foreign currency funding-linked base rate plus 1.75%, due September 2017
Debt Instrument [Line Items]
Debt Instrument, Interest Rate at Period End	3.28%	3.76%
Foreign Currency Funding-Linked Rate [Member] | Term loan, foreign currency funding-linked base rate plus 2.30%, due March 2015
Debt Instrument [Line Items]
Debt Instrument, Interest Rate at Period End	0.00%	4.29%