Quarterly report pursuant to Section 13 or 15(d)

Business Combinations Unaudited Pro forma Financial Information (Details)

v3.7.0.1
Business Combinations Unaudited Pro forma Financial Information (Details) - Otometrics [Member] - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Business Acquisition [Line Items]        
Revenue $ 122,227 $ 123,483 $ 246,887 $ 238,338
Net income (loss) $ (2,634) $ 695 $ (286) $ (183)
Earnings (loss) per share:        
Basic (usd per share) $ (0.08) $ 0.02 $ (0.01) $ (0.01)
Diluted (usd per share) $ (0.08) $ 0.02 $ (0.01) $ (0.01)
Weighted average shares used in the calculation of earnings per share:        
Basic (shares) 32,529 32,438 32,507 32,521
Diluted (shares) 32,529 32,983 32,507 33,118