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Stocholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2019
Earnings Per Share [Abstract] |
Schedule of Weighted Average Number of Shares [Table Text Block] | The following table provides the computation of diluted weighted average number of common shares outstanding:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Computation of diluted weighted average shares outstanding: |  |  |  |  |  |  |
Basic weighted average shares outstanding | 53,212,759 |  |  | 51,226,898 |  |  | 52,546,647 |  |  | 51,563,090 |
Incremental shares from assumed exercise of stock options and vesting of restricted stock | 1,489,700 |  |  | 1,494,766 |  |  | 1,399,123 |  |  | 1,537,018 |
Incremental shares from assumed conversion of convertible notes | — |  |  | 771,171 |  |  | — |  |  | 771,171 |
Diluted weighted average shares outstanding | 54,702,459 |  |  | 53,492,835 |  |  | 53,945,770 |  |  | 53,871,279 |

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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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