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Schedule II, Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2014
Valuation and Qualifying Accounts [Abstract]  
Schedule II, Valuation and Qualifying Accounts
PUBLIC SERVICE CO. OF COLORADO AND SUBSIDIARIES
VALUATION AND QUALIFYING ACCOUNTS
YEARS ENDED DEC. 31, 2014, 2013 AND 2012
(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:
 
 
 
 
 
 
 
 
 
2014
$
22,505

 
$
17,005

 
$
6,240

 
$
22,628

 
$
23,122

2013
21,918

 
16,784

 
7,005

 
23,202

 
22,505

2012
24,698

 
16,323

 
7,648

 
26,751

 
21,918


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