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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Basic EPS [Abstract] |  |  |  |
Weighted average common shares outstanding (in shares) | 44,007,000 | 43,865,000 | 44,079,000 | 43,829,000
Net income | $ 19,281 | $ 27,640 | $ 37,447 | $ 45,649
Basic EPS (in dollars per share) | $ 0.44 | $ 0.63 | $ 0.85 | $ 1.04
Diluted EPS [Abstract] |  |  |  |
Weighted average common shares outstanding (in shares) | 44,007,000 | 43,865,000 | 44,079,000 | 43,829,000
Dilutive effect of common stock options and restricted stock (in shares) | 523,000 | 498,000 | 510,000 | 500,000
Weighted average common shares and common share equivalents (in shares) | 44,530,000 | 44,363,000 | 44,589,000 | 44,329,000
Net income | $ 19,281 | $ 27,640 | $ 37,447 | $ 45,649
Diluted EPS (in dollars per share) | $ 0.43 | $ 0.62 | $ 0.84 | $ 1.03
Stock Options [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Stock options excluded from calculation of diluted EPS (in shares) | 339,109 | 503,058 | 340,034 | 500,541

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