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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Allowance for doubtful accounts      
Changes in valuation and qualifying accounts      
Balance at Beginning of Period $ 16,002 $ 12,827 $ 15,943
Additions: Charged to Costs and Expenses 1,391 1,227 1,743
Additions: Charged to Other Accounts [1] (1,239) 3,792 (1,037)
Deductions [2] 1,375 1,844 3,822
Balance at End of Period 14,779 16,002 12,827
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]      
Changes in valuation and qualifying accounts      
Balance at Beginning of Period 71,546 69,400 68,694
Additions: Charged to Costs and Expenses 9,606 3,691 1,891
Additions: Charged to Other Accounts [1] (6,741) (481) 2,437
Deductions [2] 8,998 1,064 3,622
Balance at End of Period $ 65,413 $ 71,546 $ 69,400
[1] Currency translation adjustment, reductions from restructuring and other adjustments.
[2] For the Allowance for doubtful accounts, deductions relate to uncollectible accounts written-off, net of recoveries. For the Deferred tax asset valuation allowance, deductions relate to the reversal of valuation allowances due to the realization of net operating loss carryforwards.