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CONSOLIDATED STATEMENTS OF EQUITY (USD $) In Thousands, except Share data, unless otherwise specified | Common Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Income (Loss) | Treasury Stock | Accumulated Deficit | Noncontrolling Interest | Total
--- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2011 | $ 704 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 3,645,332 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 6,059 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (206,937)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ (2,007,922)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 242,806 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | $ 1,680,042 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Balance (in shares) at Dec. 31, 2011 |  |  |  | (6,143,589)us-gaap_TreasuryStockShares / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |
Balance (in shares) at Dec. 31, 2011 | 70,407,010 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Treasury stock purchased |  |  |  | (2,422)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  | (2,422)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
Treasury stock purchased (in shares) |  |  |  | (157,233)us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |
Options exercised |  | 562 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  | 562 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Options exercised (in shares) | 34,285 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Shares issued in employee stock purchase plan | 1 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,634 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  | 1,635 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan
Shares issued in employee stock purchase plan (in shares) | 132,784 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Stock-based compensation, net of forfeitures | 8 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 15,373 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 589 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 15,970 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Stock-based compensation, net of forfeitures (in shares) |  |  |  | (75,604)us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |
Stock-based compensation, net of forfeitures (in shares) | 717,151 exh_StockIssuedDuringPeriodSharesShareBasedCompensationPlans / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Income tax benefit from stock-based compensation expense |  | (1,345)us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  | (1,345)us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation
Net proceeds from the sale of Partnership units, net of tax |  | 49,202 exh_SaleOfSubsidiaryStock / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 35,920 exh_SaleOfSubsidiaryStock / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 85,122 exh_SaleOfSubsidiaryStock
Cash distribution to noncontrolling unitholders of the Partnership |  |  |  |  |  | (57,084)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (57,084)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
Comprehensive income (loss): |  |  |  |  |  |  |
Net income (loss) |  |  |  |  | (39,486)us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 2,317 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (37,169)us-gaap_ProfitLoss
Derivatives gain (loss), net of reclassifications to earnings and tax |  |  | 6,781 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  | (902)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 5,879 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
Adjustments from changes in ownership of Partnership |  |  | 360 exh_OtherComprehensiveIncomeAdjustmentsFromChangesInOwnershipOfPartnership / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |  | 360 exh_OtherComprehensiveIncomeAdjustmentsFromChangesInOwnershipOfPartnership
Amortization of terminated interest rate swaps, net of tax |  |  | 6,947 exh_OtherComprehensiveIncomeAmortizationOfDeferredGainLossOnDiscontinuationOfInterestRateCashFlowHedge / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |  | 6,947 exh_OtherComprehensiveIncomeAmortizationOfDeferredGainLossOnDiscontinuationOfInterestRateCashFlowHedge
Foreign currency translation adjustment |  |  | 3,762 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |  | 3,762 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Balance at Dec. 31, 2012 | 713 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 3,710,758 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 23,909 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (209,359)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (2,047,408)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 223,646 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 1,702,259 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Balance (in shares) at Dec. 31, 2012 |  |  |  | (6,376,426)us-gaap_TreasuryStockShares / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |
Balance (in shares) at Dec. 31, 2012 | 71,291,230 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Treasury stock purchased |  |  |  | (4,539)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  | (4,539)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
Treasury stock purchased (in shares) |  |  |  | (173,267)us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |
Options exercised | 4 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 8,317 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  | 8,321 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Options exercised (in shares) | 459,416 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Shares issued in employee stock purchase plan | 1 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,631 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  | 1,632 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan
Shares issued in employee stock purchase plan (in shares) | 66,259 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Stock-based compensation, net of forfeitures | 7 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 15,509 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 732 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 16,248 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Stock-based compensation, net of forfeitures (in shares) |  |  |  | (32,375)us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |
Stock-based compensation, net of forfeitures (in shares) | 683,868 exh_StockIssuedDuringPeriodSharesShareBasedCompensationPlans / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Income tax benefit from stock-based compensation expense |  | 1,782 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  | 1,782 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation
Adjustments from changes in ownership of Partnership |  | 31,573 exh_AdjustmentsFromChangesInOwnershipOfPartnership / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | (49,238)exh_AdjustmentsFromChangesInOwnershipOfPartnership / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (17,665)exh_AdjustmentsFromChangesInOwnershipOfPartnership
Cash distribution to noncontrolling unitholders of the Partnership |  |  |  |  |  | (61,959)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (61,959)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
Other |  | (141)us-gaap_StockholdersEquityOther / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  | (141)us-gaap_StockholdersEquityOther
Comprehensive income (loss): |  |  |  |  |  |  |
Net income (loss) |  |  |  |  | 123,164 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 32,578 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 155,742 us-gaap_ProfitLoss
Derivatives gain (loss), net of reclassifications to earnings and tax |  |  | (372)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  | 5,579 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 5,207 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
Adjustments from changes in ownership of Partnership |  |  | (703)exh_OtherComprehensiveIncomeAdjustmentsFromChangesInOwnershipOfPartnership / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |  | (703)exh_OtherComprehensiveIncomeAdjustmentsFromChangesInOwnershipOfPartnership
Amortization of terminated interest rate swaps, net of tax |  |  | 2,713 exh_OtherComprehensiveIncomeAmortizationOfDeferredGainLossOnDiscontinuationOfInterestRateCashFlowHedge / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |  | 2,713 exh_OtherComprehensiveIncomeAmortizationOfDeferredGainLossOnDiscontinuationOfInterestRateCashFlowHedge
Foreign currency translation adjustment |  |  | 4,531 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |  | 4,531 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Balance at Dec. 31, 2013 | 725 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 3,769,429 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 30,078 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (213,898)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (1,924,244)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 151,338 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 1,813,428 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Balance (in shares) at Dec. 31, 2013 |  |  |  | (6,582,068)us-gaap_TreasuryStockShares / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  | (6,582,068)us-gaap_TreasuryStockShares
Balance (in shares) at Dec. 31, 2013 | 72,500,773 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Treasury stock purchased |  |  |  | (7,044)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  | (7,044)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
Treasury stock purchased (in shares) |  |  |  | (172,232)us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  | (172,232)us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
Options exercised | 7 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 12,812 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  | 12,819 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Options exercised (in shares) | 729,685 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Cash dividends |  |  |  |  | (40,319)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (40,319)us-gaap_DividendsCommonStockCash
Shares issued in employee stock purchase plan |  | 1,812 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  | 1,812 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan
Shares issued in employee stock purchase plan (in shares) | 50,232 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Stock-based compensation, net of forfeitures | 5 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 17,844 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 1,167 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 19,016 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Stock-based compensation, net of forfeitures (in shares) |  |  |  | (42,213)us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |
Stock-based compensation, net of forfeitures (in shares) | 466,011 exh_StockIssuedDuringPeriodSharesShareBasedCompensationPlans / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Income tax benefit from stock-based compensation expense |  | 6,586 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  | 6,586 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation
Net proceeds from the sale of Partnership units, net of tax |  | 74,521 exh_SaleOfSubsidiaryStock / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 51,212 exh_SaleOfSubsidiaryStock / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 125,733 exh_SaleOfSubsidiaryStock
Cash distribution to noncontrolling unitholders of the Partnership |  |  |  |  |  | (74,856)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (74,856)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
Redemption of convertible debt | 1 exh_AdjustmentToEquityRedemptionOfConvertibleDebt / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (234,219)exh_AdjustmentToEquityRedemptionOfConvertibleDebt / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 219,211 exh_AdjustmentToEquityRedemptionOfConvertibleDebt / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  | (15,007)exh_AdjustmentToEquityRedemptionOfConvertibleDebt
Redemption of convertible debt (in shares) | 61,499 exh_AdjustmentToEquityRedemptionOfConvertibleDebtShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 6,711,587 exh_AdjustmentToEquityRedemptionOfConvertibleDebtShares / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |
Shares acquired from exercise of call options |  | 89,407 exh_AdjustmentsToEquitySharesAcquiredFromExerciseOfCallOptions / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | (89,407)exh_AdjustmentsToEquitySharesAcquiredFromExerciseOfCallOptions / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |
Shares acquired from exercise of call options (in shares) |  |  |  | (6,522,301)exh_AdjustmentsToEquitySharesAcquiredFromExerciseOfCallOptionsShares / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |
Shares issued for exercise of warrants |  | (22,606)exh_AdjustmentsToEquityStockIssuedDuringPeriodValueWarrantsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 22,606 exh_AdjustmentsToEquityStockIssuedDuringPeriodValueWarrantsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |
Shares issued for exercise of warrants (in shares) |  |  |  | 1,644,214 exh_AdjustmentsToEquityStockIssuedDuringPeriodSharesWarrantsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |
Comprehensive income (loss): |  |  |  |  |  |  |
Net income (loss) |  |  |  |  | 98,166 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 27,716 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 125,882 us-gaap_ProfitLoss
Derivatives gain (loss), net of reclassifications to earnings and tax |  |  | (2,574)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  | (792)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (3,366)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
Adjustments from changes in ownership of Partnership |  |  | 65 exh_OtherComprehensiveIncomeAdjustmentsFromChangesInOwnershipOfPartnership / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |  | 65 exh_OtherComprehensiveIncomeAdjustmentsFromChangesInOwnershipOfPartnership
Amortization of terminated interest rate swaps, net of tax |  |  | 2,944 exh_OtherComprehensiveIncomeAmortizationOfDeferredGainLossOnDiscontinuationOfInterestRateCashFlowHedge / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |  | 2,944 exh_OtherComprehensiveIncomeAmortizationOfDeferredGainLossOnDiscontinuationOfInterestRateCashFlowHedge
Foreign currency translation adjustment |  |  | (14,648)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |  | (14,648)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Balance at Dec. 31, 2014 | $ 738 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 3,715,586 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 15,865 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (68,532)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ (1,866,397)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 155,785 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | $ 1,953,045 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Balance (in shares) at Dec. 31, 2014 |  |  |  | (4,963,013)us-gaap_TreasuryStockShares / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  | (4,963,013)us-gaap_TreasuryStockShares
Balance (in shares) at Dec. 31, 2014 | 73,808,200 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |

X
- Definition Represents adjustments to additional paid in capital and minority interest resulting from the sale of partnership units or other changes in ownership in the Partnership. + References No definition available. + Details
Name: | exh_AdjustmentsFromChangesInOwnershipOfPartnership
Namespace Prefix: | exh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the amount of increase (decrease) in equity accounts due to shares acquired from exercise of call options. + References No definition available. + Details
Name: | exh_AdjustmentsToEquitySharesAcquiredFromExerciseOfCallOptions
Namespace Prefix: | exh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of shares related to shares acquired from exercise of call options. + References No definition available. + Details
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- Definition Amount after tax and reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 + Details
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