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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
Allowances for doubtful accounts      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of Year $ 1,593 $ 1,258 $ 877
Additions Charged to Expense 1,355 955 821
Additions Charged to Other Accounts 41 574  
Write Offs (1,602) (1,162) (440)
Other [1] (45) (32)  
Balance at end of Year 1,342 1,593 1,258
Deferred tax valuation allowance      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of Year 2,837 3,295 12,393
Additions Charged to Expense 1,406   95
Additions Charged to Other Accounts   402 2,589
Write Offs (176) (860) (11,782)
Other [1] (69)    
Balance at end of Year $ 3,998 $ 2,837 $ 3,295
[1] “Other” primarily includes foreign exchange translation adjustments.