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Employee Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2012
Schedule of Fair Value of Awarded Stock Option Estimated on Grant Date Using Black-Scholes Option- Pricing Model | The fair value of each award of stock options was estimated on the grant date using the Black-Scholes option- pricing model with the following assumptions:
|  | Grant date assumptions |
|  | 2012 |  |  | 2011 |  |  | 2010 |  |  | 2009 |  |  | 2008 |  |  | 2007 |
Expected term (1) |  |  | 5 years |  |  |  | 5 years |  |  |  | 4.5 years |  |  |  | 5 years |  |  |  | 2.4 years |  |  |  | 5 years |
Expected volatility factor (2) |  |  | 54.95 | % |  |  | 52.52 | % |  |  | 48.58 | % |  |  | 39.17 | % |  |  | 36.41 | % |  |  | 39.67 | %
Risk-free interest rate (3) |  |  | 0.70 | % |  |  | 2.00 | % |  |  | 2.62 | % |  |  | 3.32 | % |  |  | 2.13 | % |  |  | 4.54 | %
Actual dividends (4) |  | $ | 0.44 |  |  | $ | 0.44 |  |  | $ | 0.44 |  |  | $ | 0.44 |  |  | $ | 0.44 |  |  | $ | 0.40 |
(1) | The expected term was determined based on actual awards.
(2) | The volatility factor was measured using the weighted average of historical daily price changes of the Company’s Class A Stock over a historical period commensurate to the expected term of the awards.
(3) | The risk-free interest rate was based on periods equal to the expected term of the awards based on the U.S. Treasury yield curve in effect at the time of grant.
(4) | Actual dividends were used to compute the expected annual dividend yield.
Schedule of Stock Option Activity | Stock option activity under the EIP since January 1, 2011 is summarized as follows:
|  | Year ended December 31, 2012 |  |  | Year ended December 31, 2011 |
|  | Number of shares |  |  | Weighted average exercise price |  |  | Number of shares |  |  | Weighted average exercise price |
Options outstanding, beginning of year |  |  | 164,193 |  |  | $ | 29.04 |  |  |  | 284,976 |  |  | $ | 34.39 |
Options granted |  |  | 1,590 |  |  | $ | 19.31 |  |  |  | 37,333 |  |  | $ | 26.18 |
Options exercised |  |  | — |  |  |  | — |  |  |  | (13,532 | ) |  | $ | 24.88 |
Options forfeited or expired |  |  | (78,980 | ) |  | $ | 35.09 |  |  |  | (144,584 | ) |  | $ | 39.24 |
Options outstanding, end of year |  |  | 86,803 |  |  | $ | 23.35 |  |  |  | 164,193 |  |  | $ | 29.04 |
Options vested, end of year |  |  | 36,023 |  |  | $ | 22.59 |  |  |  | 87,279 |  |  | $ | 32.86 |
Weighted average fair value of options granted during the year |  | $ | 7.67 |  |  |  |  |  |  | $ | 10.89 |  |  |  |  |
Summarizes Stock Options Outstanding and Exercisable | The following table summarizes stock options outstanding and exercisable as at December 31, 2012:
Range of exercise prices |  | Number outstanding |  |  | Weighted average remaining contractual life |  |  | Weighted average exercise price of outstanding options |  |  | Number exercisable (vested) |  |  | Weighted average exercise price of vested options |
$9.60 - $25.00 |  |  | 31,454 |  |  |  | 1.44 years |  |  | $ | 13.76 |  |  |  | 16,757 |  |  | $ | 12.91 |
$25.01 - $39.45 |  |  | 55,349 |  |  |  | 2.57 years |  |  | $ | 28.81 |  |  |  | 19,266 |  |  | $ | 31.01 |
$9.60 - $39.45 |  |  | 86,803 |  |  |  | 2.16 years |  |  | $ | 23.35 |  |  |  | 36,023 |  |  | $ | 22.59 |
Summarizes of Company's Non-Vested Options | The following table summarizes the status of the Company’s non-vested options for the year ended December 31, 2012:
|  | Year ended December 31, 2012 |
|  | Number of Options |  |  | Weighted average fair value |
Non-vested beginning of year |  |  | 76,914 |  |  | $ | 8.88 |
Granted |  |  | 1,590 |  |  | $ | 7.67 |
Vested |  |  | (27,724 | ) |  | $ | 9.03 |
Forfeited or expired |  |  | — |  |  | $ | — |
Non-vested end of year |  |  | 50,780 |  |  | $ | 9.49 |
Summarizes of Company's Non-Vested ESP Awards | The following table summarizes the status of the Company’s non-vested ESP awards for the year ended December 31, 2012:
|  | Number of shares of Class A Stock subject to ESP awards |  |  | Weighted average fair value |  |  | Remaining contractual life |
Non-vested beginning of year |  |  | 760,902 |  |  | $ | 20.94 |  |  |  | 2.8 years |
Granted |  |  | 174,818 |  |  | $ | 15.64 |  |  |  | 3.7 years |
Vested |  |  | (57,652 | ) |  | $ | 21.60 |  |  |  | — |
Forfeited or expired |  |  | (28,000 | ) |  | $ | 24.08 |  |  |  | — |
Non-vested end of year |  |  | 850,068 |  |  | $ | 19.38 |  |  |  | 2.3 years |
Stock Appreciation Rights | The fair value of each OARs award was estimated as at December 31, 2012 using the Black-Scholes option-pricing model.
Grant date |  | Number of OARs outstanding |  |  | Strike price |  |  | Remaining contractual life |  |  | Fair value as at December 31, 2012 |
January 10, 2008 |  |  | 383,645 |  |  | $ | 37.78 |  |  |  | 9 days |  |  | $ | — |
January 12, 2009 |  |  | 358,930 |  |  | $ | 12.74 |  |  |  | 1 year |  |  | $ | 5.83 |
January 19. 2010 |  |  | 292,560 |  |  | $ | 30.68 |  |  |  | 2 years |  |  | $ | 1.65 |
January 13, 2011 |  |  | 392,630 |  |  | $ | 26.35 |  |  |  | 3 years |  |  | $ | 2.12 |
January 19, 2012 |  |  | 428,230 |  |  | $ | 18.94 |  |  |  | 4 years |  |  | $ | 5.74 |
|  |  | 1,855,995 |  |  |  |  |  |  |  |  |  |  |  |  |
Total weighted average values |  |  |  |  |  | $ | 25.05 |  |  |  | 2.1 year | s |  | $ | 3.16 |

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