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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
Increase (decrease) in valuation allowance     $ (49,600,000)
Accounts Receivable Reserves      
Balance at beginning of period $ 1,109 $ 1,630 1,066
Charged to cost and expenses 1,244 2,173 1,604
Write-offs, Exchange Rate Fluctuations and Other Items (1,110) (2,694) (1,040)
Balance at end of period 1,243 1,109 1,630
Valuation Allowance Of Deferred Tax Assets [Member]      
Balance at beginning of period 11,986 11,125 59,391
Net additions charged to income (expense) (1,922) 874 (47,659)
Write-offs, Exchange Rate Fluctuations and Other Items (1,102) (13) (607)
Balance at end of period $ 8,962 $ 11,986 $ 11,125