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Schedule II, Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract]  
Schedule II, Valuation and Qualifying Accounts
SOUTHWESTERN PUBLIC SERVICE CO.
VALUATION AND QUALIFYING ACCOUNTS
YEARS ENDED DEC. 31, 2017, 2016 AND 2015
(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:
 
 
 
 
 
 
 
 
 
 
2017
 
$
6,379

 
$
5,091

 
$
1,169

 
$
6,291

 
$
6,348

2016
 
5,888

 
6,066

 
907

 
6,482

 
6,379

2015
 
5,839

 
4,655

 
1,036

 
5,642

 
5,888


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