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Schedule II, Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2013
Valuation and Qualifying Accounts [Abstract]  
Schedule II, Valuation and Qualifying Accounts
NSP-WISCONSIN AND SUBSIDIARIES
VALUATION AND QUALIFYING ACCOUNTS
YEARS ENDED DEC. 31, 2013, 2012 AND 2011
(amounts in thousands)
 
 
 
Additions
 
 
 
 
 
Balance at
Jan. 1
 
Charged to Costs and Expenses
 
Charged to Other
Accounts(a)
 
Deductions from 
Reserves(b)
 
Balance at
Dec. 31
Allowance for bad debts:
 
 
 
 
 
 
 
 
 
2013
$
4,333

 
$
3,988

 
$
1,199

 
$
4,609

 
$
4,911

2012
4,766

 
3,329

 
1,310

 
5,072

 
4,333

2011
4,262

 
3,842

 
1,241

 
4,579

 
4,766


(a) 
Recovery of amounts previously written off.
(b) 
Principally bad debts written off.