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Accumulated Other Comprehensive Income (Loss) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Equity [Abstract]        
Percentage of Pension Liability Adjustment Capitalized into Construction Work In Process     23.60% 19.60%
Percentage of Pension Liability Adjustment Capitalized into Other Accounts     1.70% 1.10%
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning Balance     $ (58,140) $ (81,630)
Amounts reclassified from AOCI (pre-tax)     (7,513) (4,264)
Income tax impact of amounts reclassified     2,965 1,692
Other OCI changes (pre-tax)     10,049 18,693
Income tax impact of other OCI changes     (3,893) (7,417)
Net change after income taxes (644) 5,668 1,608 8,704
Ending Balance (56,532) (72,926) (56,532) (72,926)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
       
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning Balance     25,748 16,406
Amounts reclassified from AOCI (pre-tax)     (11,544) (9,190)
Income tax impact of amounts reclassified     4,547 3,639
Other OCI changes (pre-tax)     10,202 19,056
Income tax impact of other OCI changes     (3,946) (7,544)
Net change after income taxes     (741) 5,961
Ending Balance 25,007 22,367 25,007 22,367
Accumulated Defined Benefit Plans Adjustment [Member]
       
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning Balance     (83,625) (97,820)
Amounts reclassified from AOCI (pre-tax)     3,864 4,773
Income tax impact of amounts reclassified     (1,524) (1,893)
Other OCI changes (pre-tax)          
Income tax impact of other OCI changes          
Net change after income taxes     2,340 2,880
Ending Balance (81,285) (94,940) (81,285) (94,940)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
       
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning Balance     (263) (216)
Amounts reclassified from AOCI (pre-tax)     167 153
Income tax impact of amounts reclassified     (58) (54)
Other OCI changes (pre-tax)     (153) (363)
Income tax impact of other OCI changes     53 127
Net change after income taxes     9 (137)
Ending Balance (254) (353) (254) (353)
Public Service Company of New Mexico [Member]
       
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning Balance     (57,877) (81,414)
Amounts reclassified from AOCI (pre-tax)     (7,680) (4,417)
Income tax impact of amounts reclassified     3,023 1,746
Other OCI changes (pre-tax)     10,202 19,056
Income tax impact of other OCI changes     (3,946) (7,544)
Net change after income taxes     1,599 8,841
Ending Balance (56,278) (72,573) (56,278) (72,573)
Public Service Company of New Mexico [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member]
       
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning Balance     25,748 16,406
Amounts reclassified from AOCI (pre-tax)     (11,544) (9,190)
Income tax impact of amounts reclassified     4,547 3,639
Other OCI changes (pre-tax)     10,202 19,056
Income tax impact of other OCI changes     (3,946) (7,544)
Net change after income taxes     (741) 5,961
Ending Balance 25,007 22,367 25,007 22,367
Public Service Company of New Mexico [Member] | Accumulated Defined Benefit Plans Adjustment [Member]
       
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning Balance     (83,625) (97,820)
Amounts reclassified from AOCI (pre-tax)     3,864 4,773
Income tax impact of amounts reclassified     (1,524) (1,893)
Other OCI changes (pre-tax)          
Income tax impact of other OCI changes          
Net change after income taxes     2,340 2,880
Ending Balance (81,285) (94,940) (81,285) (94,940)
Public Service Company of New Mexico [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
       
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning Balance          
Amounts reclassified from AOCI (pre-tax)          
Income tax impact of amounts reclassified          
Other OCI changes (pre-tax)          
Income tax impact of other OCI changes          
Net change after income taxes          
Ending Balance            
Texas-New Mexico Power Company [Member]
       
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning Balance     (263) (216)
Amounts reclassified from AOCI (pre-tax)     167 153
Income tax impact of amounts reclassified     (58) (54)
Other OCI changes (pre-tax)     (153) (363)
Income tax impact of other OCI changes     53 127
Net change after income taxes     9 (137)
Ending Balance (254) (353) (254) (353)
Texas-New Mexico Power Company [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member]
       
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning Balance          
Amounts reclassified from AOCI (pre-tax)          
Income tax impact of amounts reclassified          
Other OCI changes (pre-tax)          
Income tax impact of other OCI changes          
Net change after income taxes          
Ending Balance            
Texas-New Mexico Power Company [Member] | Accumulated Defined Benefit Plans Adjustment [Member]
       
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning Balance          
Amounts reclassified from AOCI (pre-tax)          
Income tax impact of amounts reclassified          
Other OCI changes (pre-tax)          
Income tax impact of other OCI changes          
Net change after income taxes          
Ending Balance            
Texas-New Mexico Power Company [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
       
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning Balance     (263) (216)
Amounts reclassified from AOCI (pre-tax)     167 153
Income tax impact of amounts reclassified     (58) (54)
Other OCI changes (pre-tax)     (153) (363)
Income tax impact of other OCI changes     53 127
Net change after income taxes     9 (137)
Ending Balance $ (254) $ (353) $ (254) $ (353)