Quarterly report pursuant to Section 13 or 15(d)

Leased Properties (Details 1)

v2.4.0.8
Leased Properties (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
mi
kV
Mar. 31, 2013
Pinedale Liquids Gathering System [Member]
   
Sale Leaseback Transaction [Line Items]    
Length of transmission lines physical assets 150  
Estimated useful lives of assets 26 years  
Eastern Interconnect Project [Member]
   
Sale Leaseback Transaction [Line Items]    
Length of transmission lines physical assets 216  
Power of transmission lines physical assets 345  
Estimated useful lives of assets 20 years  
Amount of depreciation of leased property $ 570 $ 570