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Summary Of Significant Accounting Policies (Narrative) (Details)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Accounting Policies [Line Items]  
Discount percentage 10.00%end_PresentValueDiscountRateCeilingTest
Additional shares available for issuance 1.8us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
Minimum [Member]  
Accounting Policies [Line Items]  
Property and equipment, useful life 2 years
Minimum [Member] | Shell U.K. Limited [Member] | Sales Revenue [Member]  
Accounting Policies [Line Items]  
Percentage of sales 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_MajorCustomersAxis
= end_ShellUkLimitedMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum [Member]  
Accounting Policies [Line Items]  
Property and equipment, useful life 5 years