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Employee Benefits Plan (Details) (Simplified Employee Pension Plan, USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Simplified Employee Pension Plan
      
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions $ 140us-gaap_DefinedContributionPlanCostRecognized
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= escr_SimplifiedEmployeePensionPlanMember		 $ 197us-gaap_DefinedContributionPlanCostRecognized
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= escr_SimplifiedEmployeePensionPlanMember		 $ 226us-gaap_DefinedContributionPlanCostRecognized
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= escr_SimplifiedEmployeePensionPlanMember