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Revision of Prior Period Financial Statements (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Retained earnings $ 3,573,172,000us-gaap_RetainedEarningsAccumulatedDeficit $ 4,304,664,000us-gaap_RetainedEarningsAccumulatedDeficit
Adjustment of opening balance | Revision of Currency Translation Adjustment    
Retained earnings 91,500,000us-gaap_RetainedEarningsAccumulatedDeficit
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Accumulated Other Comprehensive Income $ 91,500,000us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax
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