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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2018
Earnings Per Share [Abstract] |
Computation of Earnings Per Common Share |
﻿ |  |  |  |  |  |
﻿ |  |  |  |  |  |
﻿ |  | Three Months Ended
﻿ |  | March 31,
﻿(in thousands, except per share data) |  | 2018 |  | 2017
﻿Numerator: |  |  |  |  |  |
﻿Net income to common shareholders |  | $ | 72,475 |  | $ | 49,014
﻿Net income allocated to participating securities - basic and diluted |  |  | 1,366 |  |  | 1,156
﻿Net income allocated to common shareholders - basic and diluted |  | $ | 71,109 |  | $ | 47,858
﻿Denominator: |  |  |  |  |  |
﻿Weighted-average common shares - basic |  | $ | 85,241 |  | $ | 84,365
﻿Dilutive potential common shares |  |  | 182 |  |  | 259
﻿Weighted-average common shares - diluted |  | $ | 85,423 |  | $ | 84,624
﻿Earnings per common share: |  |  |  |  |  |
﻿Basic |  | $ | 0.83 |  | $ | 0.57
﻿Diluted |  | $ | 0.83 |  | $ | 0.57
﻿

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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://www.xbrl.org/2003/role/presentationRef -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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