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Stock-Based Compensation and Awards (Details 2) (2013 Plan)	Apr. 30, 2013	Dec. 31, 2014
Stock-based compensation
Maximum number of shares available under the Plan	6,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Stock Options
Stock-based compensation
Number of shares counted by each award		1exh_ShareBasedCompensationArrangementByShareBasedPaymentNumberOfSharesCountedByEachAward / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = exh_StockIncentivePlan2013Member
Stock Appreciation Rights
Stock-based compensation
Number of shares counted by each award		1exh_ShareBasedCompensationArrangementByShareBasedPaymentNumberOfSharesCountedByEachAward / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember / us-gaap_PlanNameAxis = exh_StockIncentivePlan2013Member
Stock-settled award other than an option, stock appreciation right or award for which the recipient pays intrinsic value
Stock-based compensation
Number of shares counted by each award		1.75exh_ShareBasedCompensationArrangementByShareBasedPaymentNumberOfSharesCountedByEachAward / us-gaap_AwardTypeAxis = exh_StockSettledAwardsOtherThanStockOptionStockAppreciationRightsOrAwardsForWhichRecipientPaysIntrinsicValueMember / us-gaap_PlanNameAxis = exh_StockIncentivePlan2013Member

X

- Definition

Represents the number of shares counted by each award against the aggregate share limit.

+ References

No definition available.

+ Details

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- Details

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X

- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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