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Share-Based Payment Arrangements (Tables) | 3 Months Ended
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Mar. 31, 2018
Share-Based Payment Arrangements [Abstract] |
Summary of Option Activity |
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﻿ |  |  |  |  |  |  | Weighted |  |  |
﻿ |  |  |  |  |  |  | Average |  |  |
﻿ |  |  |  | Weighted |  | Remaining |  |  |
﻿ |  |  |  | Average |  | Contractual |  | Aggregate
﻿ |  | Number of |  | Exercise |  | Term |  | Intrinsic
﻿Options |  | Shares |  | Price |  | (Years) |  | Value ($000)
﻿Outstanding at January 1, 2018 |  | 88,301 |  | $ | 34.84 |  | 2.8 |  | $ | 1,294
﻿Exercised/Released |  | (24,793) |  |  | 35.12 |  |  |  |  | 495
﻿Cancelled/Forfeited |  | — |  |  | — |  |  |  |  | —
﻿Expired |  | — |  |  | — |  |  |  |  | —
﻿Outstanding at March 31, 2018 |  | 63,508 |  | $ | 34.73 |  | 2.6 |  | $ | 1,078
﻿Exercisable at March 31, 2018 |  | 63,508 |  | $ | 34.73 |  | 2.6 |  | $ | 1,078
﻿
Summary of Nonvested Restricted and Performance Shares |
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﻿ |  |  |  |  | Weighted
﻿ |  |  |  |  | Average
﻿ |  | Number of |  |  | Grant Date
﻿ |  | Shares |  |  | Fair Value
﻿Nonvested at January 1, 2018 |  | 1,708,942 |  | $ | 37.05
﻿Granted |  | 54,710 |  |  | 48.22
﻿Vested |  | (9,587) |  |  | 35.90
﻿Forfeited |  | (30,376) |  |  | 35.25
﻿Nonvested at March 31, 2018 |  | 1,723,689 |  | $ | 37.44
﻿

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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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