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Debt (Maturities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Debt Disclosure [Abstract]    
2015 $ 5,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths  
2016 70,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo  
2017 110,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree  
2018 345,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour  
2019 70,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive  
Thereafter 925,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive  
Total debt $ 1,525,000amkr_LongtermDebtIncludingRelatedPartyGross $ 1,646,350amkr_LongtermDebtIncludingRelatedPartyGross