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Commitments And Contingencies (Schedule Of Future Minimum Rental Payments Under Non-Cancelable Operating Leases) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Commitments And Contingencies [Abstract]  
2015 $ 6,181us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
2016 5,688us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
2017 4,336us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears
2018 3,165us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears
2019 and thereafter 3,498powr_OperatingLeasesFutureMinimumPaymentsDueInFiveYearsAndThereafter
Total minimum rental payments $ 22,868us-gaap_OperatingLeasesFutureMinimumPaymentsDue