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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
(in thousands)
 
Balance at Beginning of the Year
 
Amounts charged to income
 
Amounts written off
 
Balance at End of Year
Allowance for uncollectible accounts:
 
 
 
 
 
 
 
 
Year ended December 31, 2017
 
$
9,733

 
$
19,503

 
$
(20,560
)
 
$
8,676

Year ended December 31, 2018
 
$
8,676

 
$
—

 
$
(5,406
)
 
$
3,270

Year ended December 31, 2019
 
$
3,270

 
$
—

 
$
(2,012
)
 
$
1,258