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Basis of Presentation and Summary of Significant Accounting Policies (Details 2) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable |  |
Net dilutive potential common shares issuable | 568 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 15,979 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
On exercise of options where exercise price is greater than average market value for the period |  |
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable |  |
Net dilutive potential common shares issuable | 568 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = exh_StockOptionsWithExercisePriceAboveMarketPriceMember | 586 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = exh_StockOptionsWithExercisePriceAboveMarketPriceMember
4.25% convertible senior notes due June 2014 |  |
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable |  |
Net dilutive potential common shares issuable |  | 15,393 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = exh_ConvertibleSeniorNotesDueJune2014Member

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 + Details
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