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Fair Value of Derivative and Other Financial Instruments, Debt Maturities (Details) (USD $) In Thousands | Jun. 30, 2011
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Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |
Available-for-sale debt securities, Within 1 year | $ 1,988
Available-for-sale debt securities, After 1 year through 5 years | 20,208
Available-for-sale debt securities, After 5 years through 10 years | 10,784
Available-for-sale debt securities, Over 10 years | 36,489
Available-for-sale debt securities | 69,469
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract] |
Held-to-maturity debt securities, Due within 1 year | 0
Held-to-maturity debt securities, After 1 year through 5 years | 139,108
Held-to-maturity debt securities, After 5 years through 10 years | 3,262
Held-to-maturity debt securities, Over 10 years | 0
Held-to-maturity debt securities | 142,370
Public Service Company of New Mexico [Member] |
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract] |
Held-to-maturity debt securities, Due within 1 year | 0
Held-to-maturity debt securities, After 1 year through 5 years | 128,034
Held-to-maturity debt securities, After 5 years through 10 years | 0
Held-to-maturity debt securities, Over 10 years | 0
Held-to-maturity debt securities | $ 128,034

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