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Earnings per Share | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings per Share Net income is divided by the weighted average number of common shares outstanding during the period to calculate basic earnings per share. Diluted earnings per share is calculated to give effect to stock options and restricted stock units. The following table summarizes the dilutive effect of restricted stock units and options to purchase common stock for the three and six months ended June 30, 2018 and 2017:
|  | Three months ended June 30, |  | Six months ended June 30,
|  | 2018 |  | 2017 |  | 2018 |  | 2017
Weighted average common shares—basic |  | 45,920,307 |  |  | 45,717,697 |  |  | 45,850,137 |  |  | 45,644,096 |
Dilutive effect of restricted stock units |  | 176,658 |  |  | 162,153 |  |  | 267,620 |  |  | 222,996 |
Dilutive effect of stock options |  | 103,792 |  |  | 42,566 |  |  | 97,290 |  |  | 48,595 |
Weighted average common shares—diluted |  | 46,200,757 |  |  | 45,922,416 |  |  | 46,215,047 |  |  | 45,915,687 |
In November 2015, the Company announced its Board of Directors had authorized the Company to purchase its common stock up to $50 million in the aggregate. During the second quarter of 2018, the Company executed its first activity under its stock purchase program, purchasing 100,947 shares of its outstanding common stock for approximately $2.9 million.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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