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Earnings per Share Earnings per Share (Tables) | 12 Months Ended
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Dec. 31, 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 restricted shares and options to purchase common stock:
|  | Year ended December 31,
|  | 2019 |  | 2018 |  | 2017
Weighted average common shares—basic |  | 45,303,659 |  |  | 45,824,555 |  |  | 45,682,627 |
Dilutive effect of restricted share awards |  | 224,946 |  |  | 242,204 |  |  | 241,974 |
Dilutive effect of stock options |  | 66,549 |  |  | 103,705 |  |  | 65,651 |
Weighted average common shares—diluted |  | 45,595,154 |  |  | 46,170,464 |  |  | 45,990,252 |
In November 2019, the Company announced that its Board of Directors increased the Company's common stock share repurchase authorization to $150 million. The initial authorization, approved in November 2015, authorized up to $50 million in the aggregate of its common stock. During 2019 and 2018, the Company purchased 1,230,050 and 442,632 shares of its outstanding common stock for approximately $36.7 million and $12.1 million, respectively. The Company did not purchase any shares of its outstanding common stock during 2017.

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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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