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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accounts Receivable Reserves      
Balance at beginning of period $ 1,289 $ 1,243 $ 1,109
Charged to cost and expenses 1,130 1,126 1,244
Write-offs, Exchange Rate Fluctuations and Other Items (1,602) (1,080) (1,110)
Balance at end of period 817 1,289 1,243
Valuation Allowance Of Deferred Tax Assets [Member]      
Balance at beginning of period 8,586 8,962 11,986
Net additions charged to income (expense) 2,174 (138) (1,922)
Write-offs, Exchange Rate Fluctuations and Other Items (523) (238) (1,102)
Balance at end of period $ 10,237 $ 8,586 $ 8,962