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Background and Significant Accounting Policies (Details 4) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Goodwill      
Weight assigned to each approach in determining the entity's calculated fair value (as a percent) 50.00%exh_WeightedPercentageAssignedToEachApproachForValuationOfGoodwill    
Goodwill impairment $ 0us-gaap_GoodwillImpairmentLoss    
Foreign Currency Translation      
Foreign currency loss 8,800,000us-gaap_ForeignCurrencyTransactionGainLossBeforeTax 3,000,000us-gaap_ForeignCurrencyTransactionGainLossBeforeTax 8,200,000us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Non-cash losses from foreign currency exchange rate changes on intercompany obligations 3,614,000exh_GainLossOnRemeasurementOfIntercompanyBalances 4,313,000exh_GainLossOnRemeasurementOfIntercompanyBalances 7,406,000exh_GainLossOnRemeasurementOfIntercompanyBalances
Argentina      
Foreign Currency Translation      
Loss on investment in US Dollar Denominated Investments $ 6,500,000exh_GainLossBeforeTaxOnUSDollarDenominatedInvestments
/ us-gaap_StatementGeographicalAxis
= country_AR