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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Allowance for doubtful accounts      
Changes in valuation and qualifying accounts      
Balance at Beginning of Period $ 7,768 $ 7,299 $ 7,858
Additions: Charged to Costs and Expenses 1,172 1,657 1,969
Additions: Charged to Other Accounts [1] 9,501 72 (1,046)
Deductions [2] 2,498 1,260 1,482
Balance at End of Period 15,943 7,768 7,299
Valuation Allowance of Deferred Tax Assets [Member]      
Changes in valuation and qualifying accounts      
Balance at Beginning of Period 47,849 51,294 48,840
Additions: Charged to Costs and Expenses 16,222 3,704 7,533
Additions: Charged to Other Accounts [1] 4,854 3,923 (521)
Deductions [2] (231) (11,072) (4,558)
Balance at End of Period $ 68,694 $ 47,849 $ 51,294
[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.