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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Computation of Earnings Per Common Share |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  | Years Ended December 31,
﻿($ in tho usands, except per share data) |  | 2017 |  | 2016 |  | 2015
﻿Numerator: |  |  |  |  |  |  |  |  |
﻿Net income to common shareholders |  | $ | 215,632 |  | $ | 149,296 |  | $ | 131,461
﻿Net income allocated to participating securities -- basic and diluted |  |  | 4,670 |  |  | 3,598 |  |  | 2,895
﻿Net income allocated to common shareholders - basic and diluted |  | $ | 210,962 |  | $ | 145,698 |  | $ | 128,566
﻿Denominator: |  |  |  |  |  |  |  |  |
﻿Weighted-average common shares - basic |  |  | 84,695 |  |  | 77,850 |  |  | 78,197
﻿Dilutive potential common shares |  |  | 268 |  |  | 99 |  |  | 110
﻿Weighted average common shares - diluted |  |  | 84,963 |  |  | 77,949 |  |  | 78,307
﻿Earnings per common share: |  |  |  |  |  |  |  |  |
﻿Basic |  | $ | 2.49 |  | $ | 1.87 |  | $ | 1.64
﻿Diluted |  | $ | 2.48 |  | $ | 1.87 |  | $ | 1.64
﻿

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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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