v3.8.0.1

Earnings Per Share - Computation of Basic and Diluted Net Earnings (Loss) Per Share (Details) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Numerator: |  |  |  |  |  |  |  |  |  |  |
Net income | $ 28,488 | $ 13,964 | $ 10,933 | $ 13,632 | $ 11,402 | $ 5,999 | $ 7,839 | $ 8,599 | $ 67,017 | $ 33,839 | $ 47,605
Denominator: |  |  |  |  |  |  |  |  |  |  |
Denominator for basic earnings per share – weighted average shares |  |  |  |  |  |  |  |  | 20,767 | 20,704 | 20,713
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |
Employee stock options (in shares) |  |  |  |  |  |  |  |  | 80 | 69 | 74
Denominator for diluted earnings per share – weighted average shares |  |  |  |  |  |  |  |  | 20,847 | 20,773 | 20,787

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