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Net income Per Share (Tables) | 3 Months Ended
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Mar. 31, 2019
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | The following table reconciles basic net income per common share to diluted net income per share for the three months ended March 31, 2019 and 2018, respectively:
| Three Months Ended March 31,
(in thousands, except per share amounts) | 2019 |  | 2018
Net income available to common stockholders | $ | 22,662 |  |  | $ | 25,429 |
Basic weighted-average shares outstanding | 44,874 |  |  | 46,615 |
Dilutive effect of potential common stock equivalents — stock options and restricted stock units | 339 |  |  | 394 |
Diluted weighted-average shares outstanding | 45,213 |  |  | 47,009 |
Earnings per common share: |  |  |  |  |
Basic | $ | 0.51 |  |  | $ | 0.55 |
Diluted | $ | 0.50 |  |  | $ | 0.54 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + 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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