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Earnings Per Share (Earnings 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
Earnings Per Share [Abstract]        
Net income (loss) $ 1,264 $ (1,560) $ 4,085 $ (10,202)
Weighted average shares outstanding, basic 29,766 28,167 29,526 28,051
Dilutive effect of employee equity incentive plans 2,208 0 2,075 0
Weighted average shares outstanding, diluted 31,974 28,167 31,601 28,051
Net income (loss) per share, basic $ 0.04 $ (0.06) $ 0.14 $ (0.36)
Net income (loss) per share, diluted $ 0.04 $ (0.06) $ 0.13 $ (0.36)