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Intangible and Other Assets, net (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Summary of intangible and other assets, net
Deferred financing costs, net	$ 23,795us-gaap_DeferredFinanceCostsNet	$ 22,805us-gaap_DeferredFinanceCostsNet
Intangible assets, net	141,703us-gaap_IntangibleAssetsNetExcludingGoodwill	69,243us-gaap_IntangibleAssetsNetExcludingGoodwill
Deferred taxes	23,540us-gaap_DeferredTaxAssetsNetNoncurrent	28,050us-gaap_DeferredTaxAssetsNetNoncurrent
Other	54,334us-gaap_OtherAssetsNoncurrent	44,738us-gaap_OtherAssetsNoncurrent
Intangibles and other assets, net	$ 243,372exh_IntangibleAndOtherAssetsNet	$ 164,836exh_IntangibleAndOtherAssetsNet

X

- Definition

Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. Also includes noncurrent assets not separately disclosed in the balance sheet that are expected to be realized or consumed after one year.

+ References

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For an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain.

+ References

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Amount after allocation of valuation allowances of noncurrent deferred tax asset attributable to deductible temporary differences and carryforwards. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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Aggregate carrying amount, as of the balance sheet date, of noncurrent assets not separately disclosed in the balance sheet. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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