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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Allowance for doubtful accounts      
Changes in valuation and qualifying accounts      
Balance at Beginning of Period $ 7,299 $ 7,858 $ 8,398
Additions: Charged to Costs and Expenses 1,657 1,969 2,064
Additions: Charged to Other Accounts [1] 72 (1,046) (867)
Deductions [2] 1,260 1,482 1,737
Balance at End of Period 7,768 7,299 7,858
Valuation Allowance of Deferred Tax Assets [Member]      
Changes in valuation and qualifying accounts      
Balance at Beginning of Period 51,294 48,840 49,684
Additions: Charged to Costs and Expenses 3,704 7,533 8,006
Additions: Charged to Other Accounts [1] 3,923 (521) (5,923)
Deductions [2] (11,072) (4,558) (2,927)
Balance at End of Period $ 47,849 $ 51,294 $ 48,840
[1] Currency translation adjustment 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.