v2.4.0.6

Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of assumptions used in estimating fair value of stock options using Black-Scholes option pricing model | In determining the estimated fair value of our stock options as of the date of grant, we used the Black-Scholes option pricing model with the following assumptions:
| 2012 |  | 2011 |  | 2010
Risk-free interest rate | 0.68 - 1.39% |  |  | 1.22 - 2.78% |  |  | 2.00 - 3.45% |
Dividend yield | 6.75 | % |  | 6.75 | % |  | 6.75 | %
Volatility factors of the expected market price for our common stock | 35.9 - 42.9% |  |  | 35.7 - 44.3% |  |  | 37.1 - 44.6% |
Weighted average expected life of options | 4.25 - 7.0 years |  |  | 4.25 - 7.0 years |  |  | 4.25 - 7.0 years |
Summary of stock option activity | The following is a summary of stock option activity in 2012:
| Shares |  | Range of Exercise Prices |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life (years) |  | Intrinsic Value ($000’s)
Outstanding as of December 31, 2011 | 2,047,005 |  |  | $11.45 - $57.19 |  | $ | 42.10 |  |  |  |  |  |
Options granted | 459,015 |  |  | 55.13 - 55.69 |  | 55.58 |  |  |  |  |  |
Options exercised | (596,021 | ) |  | 11.45 - 57.19 |  | 36.14 |  |  |  |  |  |
Outstanding as of December 31, 2012 | 1,909,999 |  |  | 11.86 - 57.19 |  | 47.20 |  |  | 6.9 |  | $ | 33,469 |
Exercisable as of December 31, 2012 | 1,488,579 |  |  | $11.86 - $57.19 |  | $ | 44.96 |  |  | 6.3 |  | $ | 29,410 |
Summary of status of nonvested stock options and changes during the year | A summary of the status of our nonvested stock options as of December 31, 2012 and changes during the year then ended follows:
| Shares |  | Weighted Average Grant Date Fair Value
Nonvested at beginning of year | 361,040 |  |  | $ | 10.76 |
Granted | 459,015 |  |  | 10.54 |
Vested | (398,629 | ) |  | 10.40 |
Nonvested at end of year | 421,426 |  |  | $ | 10.86 |
Summary of status of nonvested restricted stock and restricted stock units and changes during the year | A summary of the status of our nonvested restricted stock and restricted stock units as of December 31, 2012, and changes during the year ended December 31, 2012 follows:
| Restricted Stock |  | Weighted Average Grant Date Fair Value |  | Restricted Stock Units |  | Weighted Average Grant Date Fair Value
Nonvested at December 31, 2011 | 592,198 |  |  | $ | 50.09 |  |  | 33,289 |  |  | $ | 50.04 |
Granted | 276,484 |  |  | 55.61 |  |  | 4,112 |  |  | 55.13 |
Vested | (271,224 | ) |  | 50.12 |  |  | (30,576 | ) |  | 50.65 |
Forfeited | (5,574 | ) |  | 49.36 |  |  | — |  |  | — |
Nonvested at December 31, 2012 | 591,884 |  |  | $ | 52.66 |  |  | 6,825 |  |  | $ | 50.34 |

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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&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 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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- Definition Tabular disclosure of the number and weighted-average grant date fair value for nonvested stock options that were outstanding at the beginning and end of the year and that were granted, forfeited or vested during the year. + References No definition available. + Details
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