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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, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Numerator:        
Net Income (Loss) $ 6,861 $ 5,043 $ 16,363 $ 12,847
Denominator:        
Weighted-average common shares outstanding, Basic (in shares) 116,027 114,116 115,683 113,854
Effect of potential dilutive common shares 4,912 3,282 3,542 2,879
Denominator:        
Weighted-average common shares outstanding, Diluted (in shares) 120,939 117,398 119,225 116,733
Earnings Per Share, Basic $ 0.06 $ 0.04 $ 0.14 $ 0.11
Earnings Per Share, Diluted $ 0.06 $ 0.04 $ 0.14 $ 0.11