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Earnings per Share Earnings per Share (Tables) | 12 Months Ended
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Dec. 31, 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 restricted shares and options to purchase common stock:
|  | Year ended December 31,
|  | 2018 |  | 2017 |  | 2016
Weighted average common shares—basic |  | 45,824,555 |  |  | 45,682,627 |  |  | 45,407,316 |
Dilutive effect of restricted share awards |  | 242,204 |  |  | 241,974 |  |  | — |
Dilutive effect of stock options |  | 103,705 |  |  | 65,651 |  |  | — |
Weighted average common shares—diluted |  | 46,170,464 |  |  | 45,990,252 |  |  | 45,407,316 |
In November 2015, the Company announced its Board of Directors had authorized the Company to purchase up to $50 million in the aggregate of its common stock. During 2018, the Company purchased 442,632 shares of its outstanding common stock for approximately $12.1 million. The Company did not purchase any shares of its outstanding common stock during 2017 or 2016.

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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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