Quarterly report pursuant to Section 13 or 15(d)

Leases (Details 2)

Leases (Details 2) (Public Service Copmany of New Mexico [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Oct. 31, 2012
Operating Leased Assets [Line Items]    
Lease termination date Apr. 01, 2015  
Number of customers served 500,000  
Sales lease back intangible asset amortized $ 1.1  
Semi annual rent payment 1.4  
Percentage of ownership in Eastern Interconnect Project   40.00%
Future Expectations [Member]
Operating Leased Assets [Line Items]    
Fair value of lease option under agreement anticipated to be received $ 7.68