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Schedule II, Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2016
Valuation and Qualifying Accounts [Abstract]  
Schedule II, Valuation and Qualifying Accounts
SOUTHWESTERN PUBLIC SERVICE CO.
VALUATION AND QUALIFYING ACCOUNTS
YEARS ENDED DEC. 31, 2016, 2015 AND 2014
(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:
 
 
 
 
 
 
 
 
 
 
2016
 
$
5,888

 
$
6,066

 
$
907

 
$
6,482

 
$
6,379

2015
 
5,839

 
4,655

 
1,036

 
5,642

 
5,888

2014
 
5,475

 
4,137

 
1,089

 
4,862

 
5,839


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