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Other Current Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Other Current Assets Disclosure [Abstract]    
Prepaid Expense, Current $ 11,716 $ 10,276
Due from prior owners of acquired businesses re: working capital settlements 768 916
Research and development tax credits receivable 377 375
Interest Receivable, Current 155 372
Income Taxes Receivable, Current 177 0
Other Receivables 703 777
Other current assets $ 13,896 $ 12,716