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Earnings Per Share | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Earnings Per Share | Note 14. Earnings Per Share ﻿ Earnings per share is calculated using the two-class method. The two-class method allocates net income to each class of common stock and participating security according to common dividends declared and participation rights in undistributed earnings. Participating securities consist of unvested share-based payment awards that contain nonforfeitable rights to dividends or dividend equivalents. ﻿ A summary of the information used in the computation of earnings per common share follows: ﻿ ﻿
﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  | 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
﻿ Potential common shares consist of employee and director stock options, unvested performance share awards, and deferred restricted units. These potential common shares do not enter into the calculation of diluted earnings per share if the imp act would be anti-dilutive, i.e., increase earnings per share or reduce a loss per share. Weighted-average anti-dilutive potential common shares totaled 10,551 for the year ended December 31, 201 7, 572,512 for the year ended December 31, 201 6, and 798,623 for the year ended December 31, 201 5.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1278-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1252-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=65016374&loc=d3e4984-109258 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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