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Earnings per Share Earnings per Share (Tables) | 9 Months Ended
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Sep. 30, 2018
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, 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 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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