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Restructuring Charges (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2014
Dec. 31, 2012
Restructuring Charges Accrual        
Additions for costs expensed $ 2,200us-gaap_RestructuringAndRelatedCostIncurredCost $ 4,800us-gaap_RestructuringAndRelatedCostIncurredCost $ 7,553us-gaap_RestructuringAndRelatedCostIncurredCost $ 6,471us-gaap_RestructuringAndRelatedCostIncurredCost
Spin-off        
Restructuring Charges Accrual        
Additions for costs expensed     2,200us-gaap_RestructuringAndRelatedCostIncurredCost
/ us-gaap_RestructuringPlanAxis
= us-gaap_SpinoffMember
 
Centralization of make-ready operations        
Restructuring Charges Accrual        
Additions for costs expensed     5,394us-gaap_RestructuringAndRelatedCostIncurredCost
/ us-gaap_RestructuringPlanAxis
= exh_CentralizationOfMakeReadyOperationsMember
 
Less non-cash expense     (4,103)us-gaap_RestructuringReserveSettledWithoutCash1
/ us-gaap_RestructuringPlanAxis
= exh_CentralizationOfMakeReadyOperationsMember
 
Reductions for payments     $ (1,291)us-gaap_PaymentsForRestructuring
/ us-gaap_RestructuringPlanAxis
= exh_CentralizationOfMakeReadyOperationsMember