XML 60 R49.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Equity (Details) (USD $) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013 | Jun. 30, 2013
Equity [Abstract] |  |  |
stock offering |  | 11,100,000 |
Share Price |  |  | $ 29.50
Common Stock, Discount on Shares |  |  | $ 0.96
Equity Forward Sale Agreement, Settlement Threshold | 10,400,000 |  |
equity forward sale agreement future settlement amount | 284,000,000 |  |
Option Indexed to Issuer's Equity, Settlement Alternatives, Cash, at Fair Value | $ 52,000,000 |  |
Net share settlement | 1,603,711 |  |

X
- Definition Funds that would be received undter the equity forward sale agreement in the future. + References No definition available. + Details
Name: | por_Equityforwardsaleagreementfuturesettlementamount
Namespace Prefix: | por_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Shares required to contractually settle Equity forward sale agreement requirements. + References No definition available. + Details
Name: | por_EquityForwardSaleAgreementSettlementThreshold
Namespace Prefix: | por_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Net share settlement + References No definition available. + Details
Name: | por_Netsharesettlement
Namespace Prefix: | por_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Public stock offering + References No definition available. + Details
Name: | por_Stockoffering
Namespace Prefix: | por_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Discount on common shares, or any unamortized balance thereof, shown separately as a deduction from the applicable account(s) as circumstances require. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187103-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 07 -Article 4 + Details
Name: | us-gaap_CommonStockDiscountOnShares
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_EquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value of each cash settlement alternative for each freestanding option contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 40 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6445032&loc=d3e90205-114008 + Details
Name: | us-gaap_OptionIndexedToIssuersEquitySettlementAlternativesCashAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Price of a single share of a number of saleable stocks of a company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
Name: | us-gaap_SharePrice
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant