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Income Taxes Valuation Allowance Rollforward (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Valuation Allowance Rollforward [Abstract]      
Balance, beginning of year $ (76,586)us-gaap_DeferredTaxAssetsValuationAllowance $ (57,734)us-gaap_DeferredTaxAssetsValuationAllowance $ (46,323)us-gaap_DeferredTaxAssetsValuationAllowance
Additions (22,877)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount (18,852)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount (11,411)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Reductions 0emax_DeferredTaxAssetsValuationReleaseOfAllowance 0emax_DeferredTaxAssetsValuationReleaseOfAllowance 0emax_DeferredTaxAssetsValuationReleaseOfAllowance
Balance, end of year $ (99,463)us-gaap_DeferredTaxAssetsValuationAllowance $ (76,586)us-gaap_DeferredTaxAssetsValuationAllowance $ (57,734)us-gaap_DeferredTaxAssetsValuationAllowance