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Schedule II, Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2015
Valuation and Qualifying Accounts [Abstract]  
Schedule II, Valuation and Qualifying Accounts
NSP-WISCONSIN AND SUBSIDIARIES
VALUATION AND QUALIFYING ACCOUNTS
YEARS ENDED DEC. 31, 2015, 2014 AND 2013
(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:
 
 
 
 
 
 
 
 
 
2015
$
5,821

 
$
3,947

 
$
1,161

 
$
5,801

 
$
5,128

2014
4,911

 
4,431

 
1,269

 
4,790

 
5,821

2013
4,333

 
3,988

 
1,199

 
4,609

 
4,911


(a) 
Recovery of amounts previously written off.
(b) 
Deductions relate primarily to bad debt write-offs.