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Fair Value of Financial Assets and Liabilities (Tables)
 6 Months Ended
Jun. 30, 2013
Fair Value Disclosures [Abstract]  
Financial Impact of Qualifying Cash Flow Hedges on Accumulated Other Comprehensive Loss
Financial Impact of Qualifying Cash Flow Hedges — The impact of qualifying interest rate cash flow hedges on SPS’ accumulated other comprehensive loss, included as a component of common stockholder’s equity and in the statement of comprehensive income, is detailed in the following table:
 
 
Three Months Ended June 30
(Thousands of Dollars)
 
2013
 
2012
Accumulated other comprehensive loss related to cash flow hedges at April 1
 
$
(1,290
)
 
$
(1,461
)
After-tax net realized losses on derivative transactions reclassified into earnings
 
43

 
43

Accumulated other comprehensive loss related to cash flow hedges at June 30
 
$
(1,247
)
 
$
(1,418
)

 
 
Six Months Ended June 30
(Thousands of Dollars)
 
2013
 
2012
Accumulated other comprehensive loss related to cash flow hedges at Jan. 1
 
$
(1,332
)
 
$
(1,504
)
After-tax net realized losses on derivative transactions reclassified into earnings
 
85

 
86

Accumulated other comprehensive loss related to cash flow hedges at June 30
 
$
(1,247
)
 
$
(1,418
)
Carrying Amount and Fair Value of Long-term Debt
As of June 30, 2013 and Dec. 31, 2012, other financial instruments for which the carrying amount did not equal fair value were as follows:
 
 
June 30, 2013
 
Dec 31, 2012
(Thousands of Dollars)
 
Carrying
Amount
 
Fair Value
 
Carrying
Amount
 
Fair Value
Long-term debt, including current portion
 
$
1,103,797

 
$
1,237,097

 
$
1,103,684

 
$
1,327,538