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Earnings per Share Earnings per Share (Tables) | 12 Months Ended
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Dec. 31, 2020
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:
|  | Year ended December 31,
|  | 2020 |  | 2019 |  | 2018
Weighted average common shares—basic |  | 43,581,232 |  |  | 45,303,659 |  |  | 45,824,555 |
Dilutive effect of restricted stock units |  | — |  |  | 224,946 |  |  | 242,204 |
Dilutive effect of stock options |  | — |  |  | 66,549 |  |  | 103,705 |
Weighted average common shares—diluted |  | 43,581,232 |  |  | 45,595,154 |  |  | 46,170,464 |

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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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