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Earnings per Share Earnings per Share (Tables) | 9 Months Ended
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Sep. 30, 2017
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 restricted shares and options to purchase common stock for the three and nine months ended September 30, 2017 and 2016:
|  | Three months ended September 30, |  | Nine months ended September 30,
|  | 2017 |  | 2016 |  | 2017 |  | 2016
Weighted average common shares—basic |  | 45,721,155 |  |  | 45,435,936 |  |  | 45,669,782 |  |  | 45,381,592 |
Dilutive effect of restricted share awards |  | 233,859 |  |  | 244,757 |  |  | 226,617 |  |  | 248,942 |
Dilutive effect of stock options |  | 74,347 |  |  | 79,762 |  |  | 57,179 |  |  | 83,339 |
Weighted average common shares—diluted |  | 46,029,361 |  |  | 45,760,455 |  |  | 45,953,578 |  |  | 45,713,873 |

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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://www.xbrl.org/2003/role/presentationRef -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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