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Earnings per Share Earnings per Share (Tables) | 6 Months Ended
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Jun. 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 six months ended June 30, 2017 and 2016:
|  | Three months ended June 30, |  | Six months ended June 30,
|  | 2017 |  | 2016 |  | 2017 |  | 2016
Weighted average common shares—basic |  | 45,717,697 |  |  | 45,429,851 |  |  | 45,644,096 |  |  | 45,354,421 |
Dilutive effect of restricted share awards |  | 162,153 |  |  | 215,881 |  |  | 222,996 |  |  | 251,035 |
Dilutive effect of stock options |  | 42,566 |  |  | 80,616 |  |  | 48,595 |  |  | 85,126 |
Weighted average common shares—diluted |  | 45,922,416 |  |  | 45,726,348 |  |  | 45,915,687 |  |  | 45,690,582 |

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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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