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Employee Benefit Plans (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Deferred Compensation Plan [Line Items]      
Percent company total match on employee deferred compensation plan contributions, maximum (in hundredths) 4.00%pool_PercentCompanytotalmatchonemployeecontributionsDeferredComp    
Matching contributions - deferred compensation plan $ 233us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution $ 36us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution $ 262us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution
Savings and Retirement 401K [Member]      
Defined Contribution Plan Disclosure [Line Items]      
Eligible employees' maximum allowable contribution as a percentage of compensation (in hundredths) 75.00%pool_EligibleEmployeesMaximumAllowableContributionAsPercentageOfCompensation
/ us-gaap_DefinedContributionPlanTypeAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
   
Percentage company total match on employee contributions, maximum (in hundredths) 4.00%pool_PercentageCompanyTotalMatchOnEmployeesContributionsMaximum
/ us-gaap_DefinedContributionPlanTypeAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
   
Company match on the first three percent of compensation deferred (in hundredths) 100.00%pool_CompanyMatchOnFirstThreePercentOfCompensationDeferred
/ us-gaap_DefinedContributionPlanTypeAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
   
Company match on deferrals between three percent and five percent of compensation (in hundredths) 50.00%pool_CompanyMatchOnDeferralsBetweenThreePercentAndFivePercentOfCompensation
/ us-gaap_DefinedContributionPlanTypeAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
   
Compensation deferred percentage eligible for one hundred percent match on employees' contributions (in hundredths) 3.00%pool_CompensationDeferredPercentageEligibleForOneHundredPercentMatchOnEmployeeContributions
/ us-gaap_DefinedContributionPlanTypeAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
   
Compensation deferred percentage eligible for fifty percent match on employee contributions (in hundredths) 5.00%pool_CompensationDeferredPercentageEligibleForFiftyPercentMatchOnEmployeeContributions
/ us-gaap_DefinedContributionPlanTypeAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
   
Matching contributions -defined contribution plans $ 5,235us-gaap_DefinedContributionPlanCostRecognized
/ us-gaap_DefinedContributionPlanTypeAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
$ 4,861us-gaap_DefinedContributionPlanCostRecognized
/ us-gaap_DefinedContributionPlanTypeAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
$ 4,589us-gaap_DefinedContributionPlanCostRecognized
/ us-gaap_DefinedContributionPlanTypeAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember