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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
(IN THOUSANDS)
 
 For the Year Ended December 31, 2020
 Balance at
beginning
of period		Additions charged to costs and expenses AcquisitionsAccounts
written off		Translation
adjustments
Other(2)
Balance at end of period
Allowance for doubtful accounts$16,428 $5,918 $— $(825)$(513)$— $21,008 
Valuation allowance on credit and operating loss carryforwards and other net deferred tax assets203,765 35,555 — — 17,851 — 257,171 
 For the Year Ended December 31, 2019
 Balance at
beginning
of period		Additions (deductions) charged to costs and expenses AcquisitionsAccounts
written off		Translation
adjustments
Other(2)
Balance at
end of
period
Allowance for doubtful accounts$9,173 $1,262 $— $(2,024)$(180)$8,197 $16,428 
Valuation allowance on credit and operating loss carryforwards and other net deferred tax assets200,280 5,659 — — (2,174)— 203,765 
 For the Year Ended December 31, 2018
 Balance at
beginning
of period		Additions charged to costs and expenses AcquisitionsAccounts
written off		Translation
adjustments
Other(2)
Balance at
end of
period
Allowance for doubtful accounts$13,392 $1,286 $— $(4,642)$(863)$— $9,173 
Valuation allowance on credit and operating loss carryforwards and other net deferred tax assets207,483 (1,821)(1)3,887 — (9,269)— 200,280 
_______________________ 
(1)The 2018 amount includes an adjustment to the 2017 foreign net operating loss carryforwards in the amount of $5.9 million.
(2)The amount relates to an adjustment to reflect the correct classification of amounts between the allowance for bad debts and Trade Receivables.