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Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2012
Summary of Fair Values for Stock-based Awards Granted Using Black-Scholes Option Pricing Model | The fair values for option awards granted in 2012, 2011 and 2010 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,
|  | 2012 |  | 2011 |  | 2010
Weighted-average fair value of grants |  | $5.07 |  | $5.63 |  | $5.30
Risk-free interest rate (range) |  | 0.5% - 1.1% |  | 1.4% -3.0% |  | 1.4% -2.6%
Dividend yield (range) |  | 3.6% - 4.7% |  | 3.4% - 4.9% |  | 4.2% - 5.6%
Expected life (range) |  | 4 - 5 years |  | 7 years |  | 4 - 5 years
Expected volatility (range) |  | 50.8% - 66.8% |  | 52.1% - 69.0% |  | 87.0% - 97.8%
Summary of Stock Option Activity | The following table reflects the stock option activity described above:
|  |  |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Term (years) |  |  | Aggregate Intrinsic Value (thousands) |
|  | Number of Options |  |  |  |
|  | Employees |  |  | Directors |  |  |  |
|  | (thousands) |  |  |  |  |  |  |  |  |  |
Balance December 31, 2009 |  |  | 3,330 |  |  |  | 22 |  |  | $ | 29.02 |  |  |  |  |  |  |  |  |
Granted |  |  | 373 |  |  |  | — |  |  |  | 10.37 |  |  |  |  |  |  |  |  |
Exercised |  |  | (212 | ) |  |  | — |  |  |  | 6.02 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (268 | ) |  |  | (2 | ) |  |  | 30.21 |  |  |  |  |  |  |  |  |
Balance December 31, 2010 |  |  | 3,223 |  |  |  | 20 |  |  | $ | 28.28 |  |  |  |  |  |  |  |  |
Granted |  |  | 276 |  |  |  | — |  |  |  | 13.72 |  |  |  |  |  |  |  |  |
Exercised |  |  | (192 | ) |  |  | — |  |  |  | 6.39 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (624 | ) |  |  | (10 | ) |  |  | 41.02 |  |  |  |  |  |  |  |  |
Balance December 31, 2011 |  |  | 2,683 |  |  |  | 10 |  |  | $ | 25.35 |  |  |  |  |  |  |  |  |
Granted |  |  | 345 |  |  |  | — |  |  |  | 13.87 |  |  |  |  |  |  |  |  |
Exercised |  |  | (266 | ) |  |  | — |  |  |  | 6.54 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (166 | ) |  |  | (10 | ) |  |  | 26.21 |  |  |  |  |  |  |  |  |
Balance December 31, 2012 |  |  | 2,596 |  |  |  | — |  |  | $ | 25.70 |  |  |  | 5.3 |  |  | $ | 7,877 |
Options exercisable at December 31, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2012 |  |  | 2,035 |  |  |  | — |  |  | $ | 29.12 |  |  |  | 4.5 |  |  | $ | 6,538 |
2011 |  |  | 2,230 |  |  |  | 10 |  |  | $ | 28.00 |  |  |  | 5.2 |  |  | $ | 5,177 |
2010 |  |  | 2,900 |  |  |  | 20 |  |  | $ | 30.27 |  |  |  | 5.8 |  |  | $ | 8,035 |
Summary of Characteristics of Options Outstanding | The following table summarizes the characteristics of the options outstanding at December 31, 2012 (in thousands):
|  | Options Outstanding |  |  |  |
Range of Exercise Prices |  | Outstanding as of 12/31/12 |  |  | Weighted- Average Remaining Contractual Life (years) |  |  | Weighted- Average Exercise Price |  |  | Options Exercisable |
|  |  |  | Exercisable as of 12/31/12 |  |  | Weighted- Average Exercise Price |
$0.00-$6.50 |  |  | 569 |  |  |  | 6.0 |  |  | $ | 6.01 |  |  |  | 569 |  |  | $ | 6.01 |
$6.51-$12.50 |  |  | 276 |  |  |  | 7.3 |  |  |  | 10.42 |  |  |  | 172 |  |  |  | 10.37 |
$12.51-$29.50 |  |  | 611 |  |  |  | 7.6 |  |  |  | 15.11 |  |  |  | 154 |  |  |  | 18.65 |
$29.51-$49.50 |  |  | 781 |  |  |  | 3.1 |  |  |  | 38.05 |  |  |  | 781 |  |  |  | 38.05 |
$49.51-$69.50 |  |  | 359 |  |  |  | 3.7 |  |  |  | 59.87 |  |  |  | 359 |  |  |  | 59.87 |
|  |  | 2,596 |  |  |  | 5.3 |  |  | $ | 25.70 |  |  |  | 2,035 |  |  | $ | 29.12 |
Activities for Unvested Stock Option Awards | The following table reflects the activity for unvested stock option awards for the year ended December 31, 2012 (options in thousands):
|  | Options |  |  | Weighted- Average Grant Date Fair Value |
Unvested at December 31, 2011 |  |  | 453 |  |  | $ | 5.34 |
Granted |  |  | 345 |  |  |  | 5.06 |
Vested |  |  | (184 | ) |  |  | 5.21 |
Forfeited |  |  | (53 | ) |  |  | 5.19 |
Unvested at December 31, 2012 |  |  | 561 |  |  | $ | 5.21 |
Activities for Unvested Restricted Stock Awards | The following table reflects the activity for unvested restricted stock awards for the year ended December 31, 2012 (awards in thousands):
|  | Awards |  |  | Weighted- Average Grant Date Fair Value |
Unvested at December 31, 2011 |  |  | 728 |  |  | $ | 9.31 |
Granted |  |  | 299 |  |  |  | 13.92 |
Vested |  |  | (433 | ) |  |  | 8.22 |
Forfeited |  |  | (46 | ) |  |  | 12.76 |
Unvested at December 31, 2012 |  |  | 548 |  |  | $ | 12.39 |
Activities for Unvested VSEP Awards | The following table reflects the activity for unvested VSEP awards for the year ended December 31, 2012 (awards in thousands):
|  | Awards |  |  | Weighted- Average Grant Date Fair Value |
Unvested at December 31, 2011 |  |  | 1,182 |  |  | $ | 13.34 |
Issued |  |  | 1,401 |  |  |  | 14.98 |
Vested |  |  | (706 | ) |  |  | 14.04 |
Forfeited |  |  | (9 | ) |  |  | 13.42 |
Unvested at December 31, 2012 |  |  | 1,868 |  |  | $ | 14.31 |
VSEP awards [Member] |
Summary of Fair Values for Stock-based Awards Granted Using Black-Scholes Option Pricing Model | The Company’s common shares granted to a participant are subject to an additional time-based vesting period and will generally vest in 20% annual increments beginning on the date of grant and on each of the first four anniversaries of the date of grant. The fair value of the 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 |  | 1.9%
Dividend yield |  | 6.2%
Expected life |  | 3.4 years
Expected volatility |  | 88%

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