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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
Allowances for doubtful accounts      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of Year $ 2,023 $ 1,342 $ 1,593
Additions Charged to Expense 414 2,470 1,355
Additions Charged to Other Accounts 39 49 41
Write Offs (1,170) (1,529) (1,602)
Other [1] (18) (309) (45)
Balance at end of Year 1,288 2,023 1,342
Deferred tax valuation allowance      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of Year 4,010 3,998 2,837
Additions Charged to Expense 1,230 1,385 1,406
Write Offs (1,851) (1,595) (176)
Other [1] (33) 222 (69)
Balance at end of Year $ 3,356 $ 4,010 $ 3,998
[1] “Other” primarily includes foreign exchange translation adjustments.