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Share-Based Payment Arrangements (Tables) | 12 Months Ended
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Dec. 31, 2017
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, 2017 |  | 456,258 |  | $ | 35.91 |  | 3.5 |  | $ | 3,734
﻿Exercised |  | (350,744) |  |  | 34.65 |  |  |  |  | 4,304
﻿Cancelled/Forfeited |  | (538) |  |  | 32.09 |  |  |  |  | 6
﻿Expired |  | (16,675) |  |  | 68.18 |  |  |  |  | —
﻿Outstanding at December 31, 2017 |  | 88,301 |  | $ | 34.84 |  | 2.8 |  | $ | 1,294
﻿Exercisable at December 31, 2017 |  | 88,301 |  | $ | 34.84 |  | 2.8 |  | $ | 1,294
﻿
Summary of Nonvested Restricted and Performance Shares |
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﻿ |  | Number of Shares |  | Weighted- Average Grant-Date Fair Value ($)
﻿Nonvested at January 1, 2017 |  | 2,152,119 |  | $ | 32.12
﻿Granted |  | 525,258 |  |  | 45.71
﻿Vested |  | (906,944) |  |  | 30.66
﻿Cancelled/Forfeited |  | (61,491) |  |  | 32.57
﻿Nonvested at December 31, 2017 |  | 1,708,942 |  | $ | 37.05
﻿

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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=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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