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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 [Member]      
Movement in Valuation Allowances and Reserves      
Balance at beginning of period $ 6,965 $ 6,475 $ 5,654
Additions - Charged to costs and expenses 4,718 1,597 1,505
Deductions [1] (1,270) (953) (633)
Translations 196 154 51
Balance at end of period 10,217 6,965 6,475
Inventory Valuation Reserve [Member]      
Movement in Valuation Allowances and Reserves      
Balance at beginning of period 11,269 5,233 6,556
Additions - Charged to costs and expenses 3,824 14,802 4,087
Deductions [2] (4,708) (8,351) (5,158)
Translations 316 415 (252)
Balance at end of period 10,069 11,269 5,233
Valuation Allowance of Deferred Tax Assets [Member]      
Movement in Valuation Allowances and Reserves      
Balance at beginning of period 8,842 1,982 1,250
Additions - Charged to costs and expenses 6,959 7,190 1,089
Deductions (132) [3] (129) [3] (290)
Translations 618 201 67
Balance at end of period $ 15,051 $ 8,842 $ 1,982
[1] Reversal of amounts previously recorded as bad debt and uncollectible accounts written off.
[2] Inventory items written off against the allowance.
[3] Deductions to the deferred tax assets valuation allowance relate to decreased deferred tax assets and the release of the valuation allowance.