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Net Income per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Net income $ 7,000 $ 2,132
Net income (loss) available to common shareholders $ 6,820 $ 2,082
Weighted average number of common shares outstanding 30,245 29,955
Basic and diluted $ 0.23 $ 0.07
Restricted Stock Units (RSUs) [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Less: earnings allocated to RSUs $ (180) $ (50)