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SCHEDULE II – VALUATION AND QUALIFYING ACCOUNTS (Tables)
12 Months Ended
Dec. 31, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS
   Allowance for Expected Credit Losses 
(in thousands)  Balance at
Beginning of
Year
   Adoption of
ASC 326
   Charged to
Costs and
Expenses
   Net
(Deductions)
Recoveries
   Balance at
End of Year
 
                          
2020  $19,658   $(3,330)  $17,536   $(13,779)  $20,085 
2019  $16,666   $   $15,145   $(12,153)  $19,658 
2018  $14,706   $   $13,606   $(11,646)  $16,666