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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS
12 Months Ended
Dec. 31, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS
SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS
Years Ended December 31, 2020, 2019, and 2018
(In Thousands)
DescriptionBalance
at
Beginning
of Year
Additions Charged
to Cost
and
Expenses
DeductionsBalance
at End
of Year
Allowance for doubtful accounts:
Year ended December 31, 2020$24 $1 — $25 
Year ended December 31, 201916 — 24 
Year ended December 31, 201823 — (15)
Deferred tax asset valuation allowance:
Year ended December 31, 2020$39,320 $6,695 (a)— $46,015 
Year ended December 31, 201938,839 481 (a)— 39,320 
Year ended December 31, 201834,889 3,950 (a)— 38,839 
(a)The 2020, 2019 and 2018 increase is comprised of valuation allowance against the TRS deferred tax assets.