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Operating activities generally involve producing and delivering goods and providing services. Operating activity cash flows include transactions, adjustments, and changes in value that are not defined as investing or financing activities. While for technical reasons this element has no balance attribute, the default assumption is a debit balance consistent with its label.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. 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Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3536-108585 false2Net Cash Provided by (Used in) Operating Activities18false 4psd_EnergyEfficiencyExpenditurespsd_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-22542000-22542USD$falsefalsefalse2truefalsefalse-22657000-22657USD$falsefalsefalse3falsefalsefalse00falsefalsefalse4truefalsefalse-48232000-48232USD$falsefalsefalse5truefalsefalse-70103000-70103USD$falsefalsefalse6truefalsefalse-106006000-106006USD$falsefalsefalse7truefalsefalse-94405000-94405USD$falsefalsefalse8truefalsefalse-95726000-95726USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThe cash outflow for acquisition of or capital improvements to increase energy efficienciesNo definition available.false2Energy Efficiency Expenditures19false 4us-gaap_NetCashProvidedByUsedInInvestingActivitiesus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-86298000-86298USD$falsetruefalse2truefalsefalse-211766000-211766USD$falsetruefalse3falsefalsefalse00falsefalsefalse4truefalsefalse-454128000-454128USD$falsetruefalse5truefalsefalse-652411000-652411USD$falsetruefalse6truefalsefalse-778075000-778075USD$falsetruefalse7truefalsefalse-1060588000-1060588USD$falsetruefalse8truefalsefalse-905767000-905767USD$falsetruefalsexbrli:monetaryItemTypemonetaryThe net cash inflow or outflow from investing activity.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3574-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. 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