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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2016
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, 2013 | 361,668 |  | $ | 17.30 |  | 1,295,000 |  | $ | 20.20
﻿Granted | 996,597 |  |  | 27.10 |  | 714,000 |  |  | 18.40
﻿Expired or forfeited | (20,000) |  |  | 24.77 |  | — |  |  | —
﻿Vested/exercised | (281,668) |  |  | 16.76 |  | (20,000) |  |  | 12.54
﻿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
﻿
Summary Of Unrestricted Stock Units Issuance |
﻿ |  |  |  |  |  |
﻿ |  |  |  |  |  |
﻿ |  | Unrestricted Stock Units
﻿ |  |  |  |  | Weighted-
﻿ |  |  |  |  | Average
﻿ |  |  |  |  | Grant Date
﻿ |  |  |  |  | Fair Value
﻿Year |  | Number |  | Per Share
﻿2014 |  | $ | 47,873 |  | $ | 30.81
﻿2015 |  |  | 68,160 |  |  | 21.93
﻿2016 |  |  | 64,603 |  |  | 21.67
﻿
Weighted-Average Assumptions Used in Estimating Grant Date Fair Values of Stock Option Awards |
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﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ | Year Ended December 31,
﻿ | 2016 |  | 2015 |  | 2014
﻿Total stock options granted |  | 274,000 |  |  |  | 259,000 |  |  |  | 714,000 |
﻿Weighted-average grant date fair value | $ | 5.31 |  |  | $ | 12.48 |  |  | $ | 17.69 |
﻿Weighted-average assumptions: |  |  |  |  |  |  |  |  |  |  |
﻿Risk-Free Rate |  | 1.2 | % |  |  | 1.3 | % |  |  | 1.8 | %
﻿Expected life of options(a) |  | 4.2 |  |  |  | 4.7 |  |  |  | 5.7 |
﻿Expected volatility(b) |  | 40.6 | % |  |  | 45.5 | % |  |  | 50.6 | %
﻿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 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=6415400&loc=d3e5070-113901 + Details
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