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Equity Compensation Plans (Details 4) (Class B Units of PNGS GP LLC, USD $) In Millions, except Share data, unless otherwise specified | 1 Months Ended |
--- | --- | ---
Jul. 31, 2010 | Dec. 31, 2012
Class B Units of PNGS GP LLC |  |
Share-based Compensation Arrangement, by Share-based Payment Award |  |
Authorized grants (in units) | 165,000 |
Units Outstanding (in units) |  | 74,250
Reserved for Future Grants, outstanding |  | 90,750
Increments (as a percent) | 25.00% |
Number of days after achievement of distribution that units will become earned, in some cases | 180 days |
Annualized distribution level one (in dollars per unit) | $ 2.00 |
Annualized distribution level two (in dollars per unit) | $ 2.30 |
Annualized distribution level three (in dollars per unit) | $ 2.50 |
Annualized distribution level four (in dollars per unit) | $ 2.70 |
Award vesting (as a percent) | 50.00% |
Award vesting on the fifth anniversary of the date of grant (as a percent) | 50.00% |
Award vesting after the fifth anniversary of the date of grant (as a percent) | 100.00% |
Threshold on distributions paid for participation in award | $ 2.5 |
Maximum participation in excess of distribution (as a percent) | 6.00% |

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- Definition The number of authorized units of the general partnership that have not yet been granted/issued and are reserved for future grants. + References No definition available. + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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