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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
PUBLIC SERVICE CO. OF COLORADO 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
$
21,918

 
$
16,784

 
$
7,005

 
$
23,202

 
$
22,505

2012
24,698

 
16,323

 
7,648

 
26,751

 
21,918

2011
24,054

 
20,371

 
7,423

 
27,150

 
24,698


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