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Earnings per Common Share (Tables) | 6 Months Ended
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Jun. 30, 2018
Earnings per common share: |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | Earnings per common share have been computed based on the following:
|  | Three Months Ended |  | Six Months Ended
|  | June 30, |  | June 30,
|  | (in thousands, except for per share data)
|  | 2018 |  | 2017 |  | 2018 |  | 2017
Income attributable to common stock |  | $ | 17,490 |  |  | $ | 7,659 |  |  | $ | 21,724 |  |  | $ | 19,499 |
Earnings allocated to participating securities |  |  | 37 |  |  |  | 24 |  |  |  | 54 |  |  |  | 64 |
Net income |  | $ | 17,527 |  |  | $ | 7,683 |  |  | $ | 21,778 |  |  | $ | 19,563 |
Weighted average common shares outstanding, including participating securities |  |  | 32,134 |  |  |  | 32,008 |  |  |  | 32,106 |  |  |  | 31,991 |
Weighted average participating securities |  |  | (20 | ) |  |  | (102 | ) |  |  | (38 | ) |  |  | (105 | )
Weighted average common shares outstanding |  |  | 32,114 |  |  |  | 31,906 |  |  |  | 32,068 |  |  |  | 31,886 |
Incremental shares from assumed conversions of options, performance units and restricted shares |  |  | 207 |  |  |  | 350 |  |  |  | 208 |  |  |  | 347 |
Weighted average common and equivalent shares outstanding |  |  | 32,321 |  |  |  | 32,256 |  |  |  | 32,276 |  |  |  | 32,233 |
Earnings per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.54 |  |  | $ | 0.24 |  |  | $ | 0.68 |  |  | $ | 0.61 |
Diluted |  |  | 0.54 |  |  |  | 0.24 |  |  |  | 0.67 |  |  |  | 0.60

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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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