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Earnings per Share (Details) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Net income | $ 22,837 | $ 12,769 | $ 31,189 | $ 16,765
Weighted average basic shares outstanding (in shares) | 31,862 | 31,709 | 31,824 | 31,698
Common stock options and restricted stock (in shares) | 691 | 474 | 674 | 521
Weighted average shares outstanding, diluted (in shares) | 32,553 | 32,183 | 32,498 | 32,219
Common shares |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Antidilutive securities excluded from earnings per share calculation (in shares) | 377 | 556 | 368 | 541

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