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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Share-Based Compensation [Abstract] |
Summary of Restricted Stock Unit and Stock Option Activity |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |
﻿ | Restricted Stock Units |  | Stock Options
﻿ |  |  | Weighted- |  |  |  | Weighted-
﻿ |  |  | Average |  |  |  | Average
﻿ |  |  | Grant Date |  |  |  | Exercise/
﻿ |  |  | Fair Value |  |  |  | (Strike) Price
﻿ | Number |  | Per Share |  | Number |  | Per Share
﻿Outstanding as of December 31, 2014 | 1,056,597 |  | $ | 26.54 |  | 1,989,000 |  | $ | 19.63
﻿Granted | 321,500 |  |  | 23.07 |  | 259,000 |  |  | 16.07
﻿Expired or forfeited | (281,560) |  |  | 23.89 |  | (250,000) |  |  | 15.97
﻿Vested/exercised | (370,940) |  |  | 27.07 |  | — |  |  | —
﻿Outstanding as of December 31, 2015 | 725,597 |  | $ | 25.28 |  | 1,998,000 |  | $ | 19.62
﻿Granted | 483,387 |  |  | 19.14 |  | 274,000 |  |  | 16.20
﻿Vested/exercised | (52,500) |  |  | 18.74 |  | (97,500) |  |  | 12.72
﻿Outstanding as of December 31, 2016 | 1,156,484 |  | $ | 22.64 |  | 2,174,500 |  | $ | 19.50
﻿Granted | 1,064,000 |  |  | 30.02 |  | 539,000 |  |  | 24.54
﻿Expired or cancelled | (20,985) |  |  | 23.91 |  | (19,466) |  |  | 26.56
﻿Vested/exercised | (801,515) |  |  | 19.38 |  | (140,000) |  |  | 21.41
﻿Outstanding as of December 31, 2017 | 1,397,984 |  | $ | 30.11 |  | 2,554,034 |  | $ | 20.45
﻿
Summary Of Unrestricted Stock Units Issuance |
﻿ |  |  |  |  |
﻿ |  |  |  |  |
﻿ |  | Unrestricted Stock Units
﻿ |  |  |  | Weighted-Average Grant
﻿Year |  | Number |  | Date Fair Value Per Share
﻿2015 |  | 68,160 |  | $ | 21.93
﻿2016 |  | 64,603 |  |  | 21.67
﻿2017 |  | 99,155 |  |  | 26.26
﻿
Weighted-Average Assumptions Used in Estimating Grant Date Fair Values of Stock Option Awards |
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ | Year Ended December 31,
﻿ | 2017 |  | 2016 |  | 2015
﻿Total stock options granted |  | 539,000 |  |  |  | 274,000 |  |  |  | 259,000 |
﻿Weighted-average grant date fair value | $ | 13.11 |  |  | $ | 5.31 |  |  | $ | 12.48 |
﻿Weighted-average assumptions: |  |  |  |  |  |  |  |  |  |  |
﻿Risk-free rate |  | 1.81 | % |  |  | 1.2 | % |  |  | 1.3 | %
﻿Expected life of options(a) |  | 4.8 |  |  |  | 4.2 |  |  |  | 4.7 |
﻿Expected volatility(b) |  | 43.09 | % |  |  | 40.6 | % |  |  | 45.5 | %
﻿Expected quarterly dividends | $ | — |  |  | $ | — |  |  | $ | — |
| (a) |  | Calculated using the simplified method due to the terms of the stock options and the limited pool of grantees.
| (b) |  | Calculated using historical volatility of the Company’s Common Stock over periods commensurate with the expected life of the option.

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -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 1 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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