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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2015
Share-Based Compensation [Abstract] |
Summary of Restricted Stock Unit and Stock Option Activity |
| Restricted Stock Units |  | Stock Options
|  |  | Weighted-Average |  |  |  |
|  |  | Grant Date |  |  |  | Weighted-Average
|  |  | Fair Value |  |  |  | Exercise/(Strike)
| Number |  | Per Share |  | Number |  | Price Per Share
Outstanding as of December 31, 2012 | 1,141,666 |  | $ | 18.12 |  | 1,315,465 |  | $ | 18.91
Granted | 246,668 |  |  | 19.87 |  | 200,000 |  |  | 20.80
Expired or forfeited | (176,667) |  |  | 13.66 |  | (140,000) |  |  | 13.04
Vested/exercised | (849,999) |  |  | 19.91 |  | (80,465) |  |  | 13.16
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
Weighted-Average Assumptions Used in Estimating Grant Date Fair Values of Stock Option Awards |
| For the Years Ended December 31,
| 2015 |  | 2014 |  | 2013
Total stock options granted |  | 259,000 |  |  |  | 714,000 |  |  |  | 200,000 |
Weighted-average grant date fair value | $ | 12.48 |  |  | $ | 17.69 |  |  | $ | 7.90 |
Weighted-average assumptions: |  |  |  |  |  |  |  |  |  |  |
Risk-Free Rate |  | 1.3 | % |  |  | 1.8 | % |  |  | 0.8 | %
Expected life of options(a) |  | 4.7 |  |  |  | 5.7 |  |  |  | 4.1 |
Expected volatility(b) |  | 45.5 | % |  |  | 50.6 | % |  |  | 51.2 | %
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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