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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS
 12 Months Ended
Dec. 31, 2019
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, 2019, 2018, and 2017
(In Thousands)
Description
Balance
at
Beginning
of Year
 
Additions Charged
to Cost
and
Expenses
 
Deductions
 
Balance
at End
of Year
Allowance for doubtful accounts:
 
 
 
 
 
 
 
Year ended December 31, 2019

$8

 
16

 
—

 

$24

Year ended December 31, 2018
23

 
—

 
(15
)
 
8

Year ended December 31, 2017
33

 
—

 
(10
)
 
23

 
 
 
 
 
 
 
 
Deferred tax asset valuation allowance:
 
 
 
 
 
 
 
Year ended December 31, 2019

$38,839

 
481

(a)
—

 

$39,320

Year ended December 31, 2018
34,889

 
3,950

(a)
—

 
38,839

Year ended December 31, 2017
21,861

 
13,028

(a)
—

 
34,889

 
 
 
 
 
(a)
The 2019, 2018 and 2017 increase is comprised of valuation allowance against the TRS deferred tax assets.