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Variable Interest Entities (Details) (USD $) | 3 Months Ended | 6 Months Ended |  | 3 Months Ended | 6 Months Ended |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  | 3 Months Ended | 6 Months Ended |  |  |  |  | 3 Months Ended | 6 Months Ended
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Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013 | Jun. 30, 2014 Public Service Company of New Mexico [Member] | Jun. 30, 2013 Public Service Company of New Mexico [Member] | Jun. 30, 2014 Public Service Company of New Mexico [Member] | Jun. 30, 2013 Public Service Company of New Mexico [Member] | Dec. 31, 2013 Public Service Company of New Mexico [Member] | Jun. 30, 2014 Palo Verde Nuclear Generating Station [Member] Public Service Company of New Mexico [Member] | Jun. 30, 2014 Palo Verde Nuclear Generating Station [Member] Property Lease Guarantee [Member] Maximum [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2012 Delta [Member] Public Service Company of New Mexico [Member] | Jun. 30, 2014 Delta [Member] Public Service Company of New Mexico [Member] | Jun. 30, 2013 Delta [Member] Public Service Company of New Mexico [Member] | Jun. 30, 2014 Delta [Member] Public Service Company of New Mexico [Member] | Jun. 30, 2013 Delta [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Delta [Member] Public Service Company of New Mexico [Member] | Jun. 30, 2014 Valencia [Member] Public Service Company of New Mexico [Member] | Jun. 30, 2013 Valencia [Member] Public Service Company of New Mexico [Member] | Jun. 30, 2014 Valencia [Member] Public Service Company of New Mexico [Member] | Jun. 30, 2013 Valencia [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Valencia [Member] Public Service Company of New Mexico [Member] | Oct. 08, 2013 Valencia [Member] Public Service Company of New Mexico [Member] | May 30, 2008 Valencia [Member] Purchased Through May 30, 2028 [Member] Public Service Company of New Mexico [Member] MW | Jun. 30, 2014 Variable Interest Entity, Not Primary Beneficiary [Member] Public Service Company of New Mexico [Member] | Jun. 30, 2014 Delta [Member] Public Service Company of New Mexico [Member] | Jun. 30, 2013 Delta [Member] Public Service Company of New Mexico [Member] | Jun. 30, 2014 Delta [Member] Public Service Company of New Mexico [Member] | Jun. 30, 2013 Delta [Member] Public Service Company of New Mexico [Member]
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of mega watts purchased (in megawatts) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 158 |  |  |  |  |
Long Term Contract For Purchase of Electric Power Fixed Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,800,000 | $ 4,700,000 | $ 9,600,000 | $ 9,400,000 |  |  |  |  | $ 1,600,000 | $ 1,600,000 | $ 3,200,000 | $ 3,200,000
Long Term Contract For Purchase of Electric Power Variable Charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000 | 200,000 | 700,000 | 300,000 |  |  |  |  | 300,000 | 400,000 | 500,000 | 600,000
Variable Interest Entity, Statement Of Operation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,307,000 | 4,922,000 | 10,238,000 | 9,697,000 |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,399,000) | (1,349,000) | (2,799,000) | (2,920,000) |  |  |  |  |  |  |  |
Earnings attributable to non-controlling interest | 3,908,000 | 3,573,000 | 7,439,000 | 6,777,000 |  | 3,908,000 | 3,573,000 | 7,439,000 | 6,777,000 |  |  |  |  |  |  |  |  |  | 3,908,000 | 3,573,000 | 7,439,000 | 6,777,000 |  |  |  |  |  |  |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current assets | 446,825,000 |  | 446,825,000 |  | 401,539,000 | 393,099,000 |  | 393,099,000 |  | 348,502,000 |  |  |  |  |  |  |  |  | 3,232,000 |  | 3,232,000 |  | 2,658,000 |  |  |  |  |  |  |
Net property, plant, and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 73,729,000 |  | 73,729,000 |  | 75,137,000 |  |  |  |  |  |  |
Total assets | 5,604,192,000 | 5,403,906,000 | 5,604,192,000 | 5,403,906,000 | 5,500,210,000 | 4,290,529,000 |  | 4,290,529,000 |  | 4,227,616,000 |  |  |  |  |  |  |  |  | 76,961,000 |  | 76,961,000 |  | 77,795,000 |  |  |  |  |  |  |
Current liabilities | 486,869,000 |  | 486,869,000 |  | 492,671,000 | 226,303,000 |  | 226,303,000 |  | 357,266,000 |  |  |  |  |  |  |  |  | 682,000 |  | 682,000 |  | 766,000 |  |  |  |  |  |  |
Owners’ equity – non-controlling interest | 76,279,000 |  | 76,279,000 |  | 77,029,000 | 76,279,000 |  | 76,279,000 |  | 77,029,000 |  |  |  |  |  |  |  |  | 76,279,000 |  | 76,279,000 |  | 77,029,000 |  |  |  |  |  |  |
Long term contract option to purchase, ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |
Long term contract option to purchase, estimated purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 85,000,000 |  |  |  |  |  |
Long term contract option to purchase, purchase price - percentage of adjusted NBV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |
Long term contract option to purchase, purchase price - percentage of FMV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |
Long term contract option to purchase, number of days to set FMV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60 days |  |  |  |  |  |  |  |  |  |  |
Long term contract option to purchase, approximate approval period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 months |  |  |  |  |  |  |  |  |  |  |
Operating Leases, Renewal Options After Original Lease Term (in years) |  |  | 6 years |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leases, Extended Lease Term Option (in years) |  |  |  |  |  |  |  | 6 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leases, Future Minimum Payments Due |  |  |  |  |  |  |  |  |  |  | 36,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating leases, future minimum payments due, renewal term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 145,200,000 |  |  |  |
Loss Contingency, Range of Possible Loss, Portion Not Accrued |  |  |  |  |  |  |  |  |  |  |  | 144,700,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leases, Future Minimum Payments Due, Next Six Months |  |  |  |  |  |  |  |  |  |  | 26,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period of Long Term Contract For Purchase of Electric Power Fixed Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 years |  |  |
Long Term Contract for Purchase of Electric Power Aggregate Amount of Contract Remaining |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 36,200,000 |  | 36,200,000 |
Payments to Acquire Businesses, Gross |  |  |  |  |  |  |  |  |  |  |  |  | 22,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,600,000 |  | 14,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 22,400,000 |  | 22,400,000 |  | 23,700,000 |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,000,000 |  | 19,000,000 |  | 20,300,000 |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,500,000 |  | 16,500,000 |  | 18,200,000 |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,500,000 | 2,200,000 | 4,300,000 | 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Net earnings | $ 29,141,000 | $ 27,678,000 | $ 41,609,000 | $ 38,304,000 |  | $ 20,346,000 | $ 26,124,000 | $ 28,021,000 | $ 37,693,000 |  |  |  |  | $ 300,000 | $ 100,000 | $ 600,000 | $ 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |

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