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Earnings per Share Earnings per Share (Tables) | 6 Months Ended
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Jun. 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 six months ended June 30, 2019 and 2018:
|  | Three months ended June 30, |  | Six months ended June 30,
|  | 2019 |  | 2018 |  | 2019 |  | 2018
Weighted average common shares—basic |  | 45,592,075 |  |  | 45,920,307 |  |  | 45,585,445 |  |  | 45,850,137 |
Dilutive effect of restricted stock units |  | 174,571 |  |  | 176,658 |  |  | 253,796 |  |  | 267,620 |
Dilutive effect of stock options |  | 61,669 |  |  | 103,792 |  |  | 71,008 |  |  | 97,290 |
Weighted average common shares—diluted |  | 45,828,315 |  |  | 46,200,757 |  |  | 45,910,249 |  |  | 46,215,047 |
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 six months ended June 30, 2019, the Company purchased 502,500 and 527,400 shares of its outstanding common stock for approximately $14.7 million and $15.4 million, respectively. During the the three and six months ended June 30, 2018, the Company purchased 100,947 shares of its outstanding common stock for approximately $2.9 million.

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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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