XML 57 R83.htm IDEA: XBRL DOCUMENT v2.4.0.6
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%