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Earnings (Loss) Per Share (Details) - 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
Numerator:        
Net Income (Loss) $ 2,605 $ 3,876 $ 5,611 $ 5,754
Denominator:        
Weighted-average common shares outstanding, Basic (in shares) 110,060 109,904 110,758 109,818
Effect of potential dilutive common shares 2,505 2,157 3,333 2,384
Denominator:        
Weighted-average common shares outstanding, Diluted (in shares) 112,565 112,061 114,091 112,202
Earnings Per Share, Basic $ 0.02 $ 0.04 $ 0.05 $ 0.05
Earnings Per Share, Diluted $ 0.02 $ 0.03 $ 0.05 $ 0.05