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Stock-Based Compensation Plans and Employee Benefits (Tables) | 12 Months Ended
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Dec. 31, 2017
Summary of Fair Values for Stock-based Awards Granted Using Black-Scholes Option Pricing Model | The fair values for option awards granted were estimated at the date of grant using the Black-Scholes option pricing model with the following weighted-average assumptions:
|  | For the Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Weighted-average fair value of grants |  | $ | 1.28 |  |  | $ | 1.61 |  |  | $ | 2.35 |
Risk-free interest rate (range) – Based upon the U.S. Treasury Strip with a maturity date that approximates the expected term of the award |  |  | 1.8% |  |  | 1.1%–1.5% |  |  | 1.4%–1.6% |
Dividend yield (range) – Forecasted dividend yield based on the expected life |  |  | 5.2% |  |  | 4.5%–5.2% |  |  | 4.1%–4.3% |
Expected life (range) – Derived by referring to actual exercise experience |  | 4 years |  |  | 4–5 years |  |  | 4–5 years |
Expected volatility (range) – Derived by using a 50/50 blend of implied and historical changes in the Company's historical stock prices over a time frame consistent with the expected life of the award |  |  | 19.8% |  |  | 20.6%–22.5% |  |  | 21.5%–23.4% |
Summary of Stock Option Activity | The following table reflects the stock option activity described above:
|  |  |  |  | Weighted- |  |  | Weighted- Average |  |  | Aggregate |
| Number of Options (Thousands) |  |  | Average Exercise Price |  |  | Remaining Contractual Term (Years) |  |  | Intrinsic Value (Thousands) |
Balance December 31, 2014 |  | 2,961 |  |  | $ | 22.48 |  |  |  |  |  |  |  |  |
Granted |  | 557 |  |  |  | 19.26 |  |  |  |  |  |  |  |  |
Exercised |  | (234 | ) |  |  | 12.85 |  |  |  |  |  |  |  |  |
Forfeited |  | (472 | ) |  |  | 36.51 |  |  |  |  |  |  |  |  |
Balance December 31, 2015 |  | 2,812 |  |  |  | 20.29 |  |  |  |  |  |  |  |  |
Granted |  | 633 |  |  |  | 16.74 |  |  |  |  |  |  |  |  |
Exercised |  | (855 | ) |  |  | 11.62 |  |  |  |  |  |  |  |  |
Forfeited |  | (784 | ) |  |  | 29.46 |  |  |  |  |  |  |  |  |
Balance December 31, 2016 |  | 1,806 |  |  |  | 19.16 |  |  |  |  |  |  |  |  |
Granted |  | 154 |  |  |  | 14.43 |  |  |  |  |  |  |  |  |
Exercised |  | (52 | ) |  |  | 7.33 |  |  |  |  |  |  |  |  |
Forfeited |  | (731 | ) |  |  | 22.31 |  |  |  |  |  |  |  |  |
Balance December 31, 2017 |  | 1,177 |  |  | $ | 17.11 |  |  |  | 5.6 |  |  | $ | 196 |
Options exercisable at December 31, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017 |  | 795 |  |  | $ | 17.46 |  |  |  | 4.5 |  |  | $ | 196 |
2016 |  | 1,038 |  |  |  | 20.49 |  |  |  | 4.5 |  |  |  | 1,608 |
2015 |  | 1,760 |  |  |  | 21.69 |  |  |  | 4.2 |  |  |  | 6,764 |
Summary of Characteristics of Options Outstanding | The following table summarizes the characteristics of the options outstanding at December 31, 2017:
|  | Options Outstanding |  |  | Options Exercisable |
Range of Exercise Prices |  | Outstanding at 12/31/17 (Thousands) |  |  | Weighted-Average Remaining Contractual Life (Years) |  |  | Weighted-Average Exercise Price |  |  | Exercisable at 12/31/17 (Thousands) |  |  | Weighted-Average Exercise Price |
$0.00–$10.00 |  |  | 67 |  |  |  | 1.0 |  |  | $ | 6.04 |  |  |  | 67 |  |  | $ | 6.04 |
$10.01–$20.00 |  |  | 1,037 |  |  |  | 6.2 |  |  |  | 16.37 |  |  |  | 655 |  |  |  | 16.36 |
$20.01–$38.29 |  |  | 73 |  |  |  | 0.1 |  |  |  | 37.70 |  |  |  | 73 |  |  |  | 37.70 |
|  |  | 1,177 |  |  |  | 5.6 |  |  | $ | 17.11 |  |  |  | 795 |  |  | $ | 17.46 |
Activities for Unvested Stock Option Awards | The following table reflects the activity for unvested stock option awards for the year ended December 31, 2017:
| Options (Thousands) |  |  | Weighted-Average Grant Date Fair Value |
Unvested at December 31, 2016 |  | 768 |  |  | $ | 1.97 |
Granted |  | 154 |  |  |  | 1.28 |
Vested |  | (394 | ) |  |  | 2.11 |
Forfeited |  | (146 | ) |  |  | 1.75 |
Unvested at December 31, 2017 |  | 382 |  |  | $ | 1.63 |
Summary of Activity of Employee Stock Option Exercises | The following table summarizes the activity of employee stock option exercises that are primarily settled with newly issued common shares or with treasury shares, if available (in millions):
| For the Year Ended December 31, |
| 2017 |  |  | 2016 |  |  | 2015 |
Cash received for exercise price | $ | 0.4 |  |  | $ | 9.9 |  |  | $ | 2.5 |
Intrinsic value |  | 0.2 |  |  |  | 6.0 |  |  |  | 1.2 |
VSEP grants [Member] |
Activities for Unvested Restricted Stock Awards | The following table reflects the activity for the unvested awards pursuant to all restricted stock grants and grants pursuant to the 2013 VSEP plans for the year ended December 31, 2017:
| Awards (Thousands) |  |  | Weighted-Average Grant Date Fair Value |
Unvested at December 31, 2016 |  | 459 |  |  | $ | 16.74 |
Granted |  | 686 |  |  |  | 13.86 |
Vested |  | (473 | ) |  |  | 15.89 |
Forfeited |  | (29 | ) |  |  | 17.20 |
Unvested at December 31, 2017 |  | 643 |  |  | $ | 14.28 |
2016 VSEP [Member] |
Summary of Fair Value of Value Sharing Equity Program Grants | The fair value of the 2016 VSEP grants was estimated on the date of grant using a Monte Carlo approach model based on the following assumptions:
| Range |
Risk-free interest rate |  | 0.8% |
Weighted-average dividend yield |  | 5.0% |
Expected life | 3 years |
Expected volatility | 17%–19% |

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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 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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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (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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