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Reportable Segments (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Reconciliation of net income to gross margin
Net income	$ 41,085us-gaap_ProfitLoss	$ 34,894us-gaap_ProfitLoss
Selling, general and administrative	86,686us-gaap_SellingGeneralAndAdministrativeExpense	92,578us-gaap_SellingGeneralAndAdministrativeExpense
Depreciation and amortization	95,808us-gaap_DepreciationDepletionAndAmortization	85,522us-gaap_DepreciationDepletionAndAmortization
Long-lived asset impairment	12,732us-gaap_AssetImpairmentCharges	3,807us-gaap_AssetImpairmentCharges
Restructuring charges	4,790us-gaap_RestructuringAndRelatedCostIncurredCost	4,822us-gaap_RestructuringAndRelatedCostIncurredCost
Interest expense	27,298us-gaap_InterestExpense	28,308us-gaap_InterestExpense
Equity in income of non-consolidated affiliates	(5,006)us-gaap_IncomeLossFromEquityMethodInvestments	(4,693)us-gaap_IncomeLossFromEquityMethodInvestments
Other (income) expense, net	7,841us-gaap_OtherNonoperatingIncomeExpense	(2,434)us-gaap_OtherNonoperatingIncomeExpense
Provision for income taxes	16,491us-gaap_IncomeTaxExpenseBenefit	9,409us-gaap_IncomeTaxExpenseBenefit
Income from discontinued operations, net of tax	(18,713)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax	(18,727)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Gross margin	$ 269,012exh_GrossMargin	$ 233,486exh_GrossMargin

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity, excluding depreciation and amortization expense. Gross margin is a non-GAAP financial measure.

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