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Schedule II - Valuation And Qualifying Accounts (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Allowances for doubtful accounts      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of Year $ 1,342 $ 1,593 $ 1,258
Additions Charged to Expense 2,470 1,355 955
Additions Charged to Other Accounts 49 41 574
Write Offs (1,529) (1,602) (1,162)
Other [1] (309) (45) (32)
Balance at end of Year 2,023 1,342 1,593
Deferred tax valuation allowance      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of Year 3,998 2,837 3,295
Additions Charged to Expense 1,385 1,406  
Additions Charged to Other Accounts     402
Write Offs (1,595) (176) (860)
Other [1] 222 (69)  
Balance at end of Year $ 4,010 $ 3,998 $ 2,837
[1] “Other” primarily includes foreign exchange translation adjustments.