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Earnings per Share | 9 Months Ended
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Sep. 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 RSUs. The following table summarizes the dilutive effect of RSUs and options to purchase common stock for the three and nine months ended September 30, 2018 and 2017:
|  | Three months ended September 30, |  | Nine months ended September 30,
|  | 2018 |  | 2017 |  | 2018 |  | 2017
Weighted average common shares—basic |  | 45,850,288 |  |  | 45,721,155 |  |  | 45,850,187 |  |  | 45,669,782 |
Dilutive effect of restricted stock units |  | 203,800 |  |  | 233,859 |  |  | 246,347 |  |  | 226,617 |
Dilutive effect of stock options |  | 112,470 |  |  | 74,347 |  |  | 102,350 |  |  | 57,179 |
Weighted average common shares—diluted |  | 46,166,558 |  |  | 46,029,361 |  |  | 46,198,884 |  |  | 45,953,578 |
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. In the three and nine months ended September 30, 2018 the Company purchased 23,191 and 124,138 shares of its outstanding common stock for approximately $0.7 million and $3.6 million, respectively. The Company did not purchase any shares of its outstanding common stock in the three and nine months ended September 30, 2017.

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