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Earnings per Share Earnings per Share (Tables) | 9 Months Ended
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Sep. 30, 2019
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |
Schedule of Weighted Average Number of Shares [Table Text Block] | The following table summarizes the dilutive effect of RSUs and options to purchase common stock for the three and nine months ended September 30, 2019 and 2018:
|  | Three months ended September 30, |  | Nine months ended September 30,
|  | 2019 |  | 2018 |  | 2019 |  | 2018
Weighted average common shares—basic |  | 45,175,244 |  |  | 45,850,288 |  |  | 45,448,711 |  |  | 45,850,187 |
Dilutive effect of restricted stock units |  | 179,418 |  |  | 203,800 |  |  | 229,003 |  |  | 246,347 |
Dilutive effect of stock options |  | 61,105 |  |  | 112,470 |  |  | 67,707 |  |  | 102,350 |
Weighted average common shares—diluted |  | 45,415,767 |  |  | 46,166,558 |  |  | 45,745,421 |  |  | 46,198,884 |
In February 2019, the Company announced its Board of Directors had authorized the Company to increase the purchase of its common stock up to $75 million in the aggregate. The previous authorization, approved in November 2015, authorized up to $50 million in share repurchases. In the three and nine months ended September 30, 2019, the Company purchased 196,128 and 723,528 shares of its outstanding common stock for approximately $5.7 million and $21.1 million, respectively. During 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.

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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