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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Allowance for doubtful accounts      
Changes in valuation and qualifying accounts      
Balance at Beginning of Period $ 15,943 $ 7,768 $ 7,299
Additions: Charged to Costs and Expenses 1,743 1,172 1,657
Additions: Charged to Other Accounts [1] (1,037) 9,501 72
Deductions [2] 3,822 2,498 1,260
Balance at End of Period 12,827 15,943 7,768
Valuation Allowance of Deferred Tax Assets [Member]      
Changes in valuation and qualifying accounts      
Balance at Beginning of Period 68,694 47,849 51,294
Additions: Charged to Costs and Expenses 1,891 16,222 3,704
Additions: Charged to Other Accounts [1] 2,437 4,854 3,923
Deductions [2] (3,622) (231) (11,072)
Balance at End of Period $ 69,400 $ 68,694 $ 47,849
[1] Currency translation adjustment, additions from acquisitions 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.