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v2.4.1.9

Long-Term Debt (Details 6) (7.25% senior notes due December 2018, USD $) In Millions, unless otherwise specified | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Nov. 30, 2010
Long-Term Debt |  |  |
Principle amount of senior notes | 350.0 us-gaap_DebtInstrumentFaceAmount |  | $ 350.0 us-gaap_DebtInstrumentFaceAmount
Interest rate (as a percent) | 7.25%us-gaap_DebtInstrumentInterestRateStatedPercentage | 7.25%us-gaap_DebtInstrumentInterestRateStatedPercentage | 7.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
Twelve month period beginning December 1, 2014 |  |  |
Long-Term Debt |  |  |
Redemption price as percentage of principal amount | 103.625%us-gaap_DebtInstrumentRedemptionPricePercentage / us-gaap_DebtInstrumentRedemptionPeriodAxis = exh_DebtInstrumentRedemptionPeriodFromDecember2014ToNovember2015Member / us-gaap_LongtermDebtTypeAxis = exh_SeniorNotesDueDecember2018Member |  |
Twelve month period beginning December 1, 2015 |  |  |
Long-Term Debt |  |  |
Redemption price as percentage of principal amount | 101.813%us-gaap_DebtInstrumentRedemptionPricePercentage / us-gaap_DebtInstrumentRedemptionPeriodAxis = exh_DebtInstrumentRedemptionPeriodFromDecember2015ToNovember2016Member / us-gaap_LongtermDebtTypeAxis = exh_SeniorNotesDueDecember2018Member |  |
Beginning December 1, 2016 and thereafter |  |  |
Long-Term Debt |  |  |
Redemption price as percentage of principal amount | 100.00%us-gaap_DebtInstrumentRedemptionPricePercentage / us-gaap_DebtInstrumentRedemptionPeriodAxis = exh_DebtInstrumentRedemptionPeriodFromDecember2016AndThereafterMember / us-gaap_LongtermDebtTypeAxis = exh_SeniorNotesDueDecember2018Member |  |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
Name: | us-gaap_DebtInstrumentRedemptionPricePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration