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Income Taxes - Deferred Tax Assets and Liabilities Classification (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Current Deferred Tax Asset, Net	$ 4,853	$ 8,125
Current Deferred Tax Liability, Net	833us-gaap_DeferredTaxLiabilitiesCurrent	88us-gaap_DeferredTaxLiabilitiesCurrent
Noncurrent Deferred Tax Asset, Net	10,662	5,045
Noncurrent Deferred Tax Liability, Net	10,416	16,350
Net deferred tax (asset) liability	$ (4,266)xrm_DeferredIncomeTaxAssetsNet	$ 3,268xrm_DeferredIncomeTaxAssetsNet

Amount of deferred tax liability attributable to taxable temporary differences, net of deferred tax asset attributable to deductible temporary differences and carryforwards net of valuation allowances expected to be realized or consumed within one year or operating cycle, if longer.

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