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Share-Based Payment Arrangements (Tables) | 12 Months Ended
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Dec. 31, 2018
Share-Based Payment Arrangements [Abstract] |
Summary of Option Activity |
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﻿Options |  | Number of Shares |  | Weighted- Average Exercise Price ($) |  | Weighted- Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value ($000)
﻿Outstanding at January 1, 2018 |  | 88,301 |  | $ | 34.84 |  | 2.8 |  | $ | 1,294
﻿Exercised |  | (35,317) |  |  | 37.39 |  |  |  |  | 592
﻿Expired |  | (6,119) |  |  | 42.82 |  |  |  |  | 10
﻿Outstanding at December 31, 2018 |  | 46,865 |  | $ | 31.88 |  | 2.6 |  | $ | 164
﻿Exercisable at December 31, 2018 |  | 46,685 |  | $ | 31.88 |  | 2.6 |  | $ | 164
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Summary of Nonvested Restricted and Performance Shares |
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﻿ |  | Number of Shares |  | Weighted- Average Grant-Date Fair Value ($)
﻿Nonvested at January 1, 2018 |  | 1,708,942 |  | $ | 37.05
﻿Granted |  | 647,376 |  |  | 39.70
﻿Vested |  | (792,084) |  |  | 33.94
﻿Cancelled/Forfeited |  | (70,193) |  |  | 36.13
﻿Nonvested at December 31, 2018 |  | 1,494,041 |  | $ | 39.89
﻿

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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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