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Stock-Based Compensation and Awards (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock-based compensation
Total stock-based compensation expense (in dollars)	$ 26,976us-gaap_AllocatedShareBasedCompensationExpense	$ 22,901us-gaap_AllocatedShareBasedCompensationExpense	$ 19,249us-gaap_AllocatedShareBasedCompensationExpense
Stock Options
Stock-based compensation
Total stock-based compensation expense (in dollars)	1,714us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	2,241us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	2,552us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Restricted stock, restricted stock units, performance units, cash settled restricted stock units, cash settled performance units and phantom units
Stock-based compensation
Total stock-based compensation expense (in dollars)	25,087us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = exh_RestrictedStockRestrictedStockUnitsPerformanceUnitsCashSettledRestrictedStockUnitsCashSettledPerformanceUnitsAndPhantomUnitsMember	20,518us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = exh_RestrictedStockRestrictedStockUnitsPerformanceUnitsCashSettledRestrictedStockUnitsCashSettledPerformanceUnitsAndPhantomUnitsMember	16,583us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = exh_RestrictedStockRestrictedStockUnitsPerformanceUnitsCashSettledRestrictedStockUnitsCashSettledPerformanceUnitsAndPhantomUnitsMember
Employee Stock Purchase Plan
Stock-based compensation
Total stock-based compensation expense (in dollars)	$ 175us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember	$ 142us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember	$ 114us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 14.F)

-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)(i)

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



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

+ Details

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- Details

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- Details

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