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Schedule II - Valuation and Qualifying Accounts and Reserves
 12 Months Ended
Dec. 31, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Schedule II - Valuation and Qualifying Accounts and Reserves
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS AND RESERVES
OTTER TAIL CORPORATION
Below is a summary of activity within valuation and qualifying accounts for the years ended December 31, 2020, 2019 and 2018:
(in thousands)Balance, January 1Charged to Cost and Expenses
Deductions1
Balance, December 31
Allowance for Credit Losses
2020$1,339 $3,138 $(1,262)$3,215 
20191,407 986 (1,054)1,339 
20181,094 1,353 (1,040)1,407 
Deferred Tax Asset Valuation Allowance
2020$800 $— $— $800 
2019600 200 — 800 
2018— 600 — 600 
1Amounts under Allowance for Credit Losses reflect deductions to the allowance for amounts written-off, net of recoveries.