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Variable Interest Entities (Details) (USD $) | 3 Months Ended |  | 3 Months Ended |  |  |  |  | 1 Months Ended | 3 Months Ended |  |  | 3 Months Ended |  |  | 3 Months Ended
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Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013 | Mar. 31, 2014 Public Service Company of New Mexico [Member] | Mar. 31, 2013 Public Service Company of New Mexico [Member] | Dec. 31, 2013 Public Service Company of New Mexico [Member] | Mar. 31, 2014 Palo Verde Nuclear Generating Station [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Palo Verde Nuclear Generating Station [Member] Public Service Company of New Mexico [Member] | Mar. 31, 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] | Mar. 31, 2014 Delta [Member] Public Service Company of New Mexico [Member] | Mar. 31, 2013 Delta [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Delta [Member] Public Service Company of New Mexico [Member] | Mar. 31, 2014 Variable Interest Entity, Not Primary Beneficiary [Member] Public Service Company of New Mexico [Member] | Mar. 31, 2014 Valencia [Member] Public Service Company of New Mexico [Member] | Mar. 31, 2013 Valencia [Member] Public Service Company of New Mexico [Member] | Dec. 31, 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 | Mar. 31, 2014 Delta [Member] Public Service Company of New Mexico [Member] | Mar. 31, 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 |  |  | $ 1,600,000 | $ 1,600,000
Long Term Contract For Purchase of Electric Power Variable Charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000 | 100,000 |  |  | 200,000 | 200,000
Variable Interest Entity, Statement Of Operation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,931,000 | 4,775,000 |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,400,000) | (1,571,000) |  |  |  |
Earnings Attributable to non-controlling interest | 3,531,000 | 3,204,000 |  | 3,531,000 | 3,204,000 |  |  |  |  |  |  |  |  |  | 3,531,000 | 3,204,000 |  |  |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current assets | 401,030,000 |  | 401,539,000 | 345,261,000 |  | 348,502,000 |  |  |  |  |  |  |  |  | 2,780,000 |  | 2,658,000 |  |  |
Net property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 74,433,000 |  | 75,137,000 |  |  |
Assets | 5,507,026,000 | 5,370,760,000 | 5,500,210,000 | 4,219,635,000 |  | 4,227,616,000 |  |  |  |  |  |  |  |  | 77,213,000 |  | 77,795,000 |  |  |
Current liabilities | 312,088,000 |  | 492,671,000 | 156,140,000 |  | 357,266,000 |  |  |  |  |  |  |  |  | 1,022,000 |  | 766,000 |  |  |
Owners' equity - non-controlling interest | 76,191,000 |  | 77,029,000 | 76,191,000 |  | 77,029,000 |  |  |  |  |  |  |  |  | 76,191,000 |  | 77,029,000 |  |  |
Long term contract option to purchase, ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |
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 |  |  |  |  |  |  | 11,800,000 | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 37,700,000 |
Payments to Acquire Businesses, Gross |  |  |  |  |  |  |  |  |  | 23,000,000 |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt |  |  |  |  |  |  |  |  |  |  | 15,400,000 |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt |  |  |  |  |  |  |  |  |  |  | 3,300,000 |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  |  |  |  |  |  |  |  |  | 23,200,000 |  | 23,700,000 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  |  |  |  |  |  |  |  |  |  | 19,700,000 |  | 20,300,000 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  |  |  |  |  |  |  |  |  |  | 17,400,000 |  | 18,200,000 |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 1,800,000 | 1,800,000 |  |  |  |  |  |  |  |
Net earnings | $ 12,468,000 | $ 10,626,000 |  | $ 7,674,000 | $ 11,569,000 |  |  |  |  |  | $ 300,000 | $ 200,000 |  |  |  |  |  |  |  |

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