v2.4.0.6

Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2011
Stock-Based Compensation |
Schedule of assumptions used in estimating fair value of stock options using Black-Scholes option pricing model |
|  | 2011 |  | 2010 |  | 2009 |
--- | --- | --- | --- | --- | --- | --- | ---
Risk-free interest rate |  |  | 1.22 - 2.78 | % |  | 2.00 - 3.45 | % |  | 1.37 - 2.32 | %
Dividend yield |  |  | 6.75 | % |  | 6.75 | % |  | 5.75 | %
Volatility factors of the expected market price for our common stock |  |  | 35.7 - 44.3 | % |  | 37.1 - 44.6 | % |  | 36.1 - 42.7 | %
Weighted average expected life of options |  |  | 4.25 - 7.0 years |  |  | 4.25 - 7.0 years |  |  | 3.5 - 6.0 years |
Summary of stock option activity |
Activity |  | Shares |  | Range of Exercise Prices |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life (years) |  | Intrinsic Value ($000's) |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Outstanding as of December 31, 2010 |  |  | 1,656,558 |  | $ | 11.34 - $45.26 |  | $ | 38.12 |  |  |  |  |  |  |
Options granted |  |  | 376,451 |  |  | 52.48 - 57.19 |  |  | 53.64 |  |  |  |  |  |  |
Options assumed from NHP |  |  | 108,785 |  |  | 48.60 - 48.60 |  |  | 48.60 |  |  |  |  |  |  |
Options exercised |  |  | (94,789 | ) |  | 11.34 - 48.60 |  |  | 26.00 |  |  |  |  |  |  |
Options canceled |  |  | — |  |  | — |  |  | — |  |  |  |  |  |  |
Outstanding as of December 31, 2011 |  |  | 2,047,005 |  |  | 11.45 - 57.19 |  |  | 42.10 |  |  | 6.9 |  | $ | 26,734 |
Exercisable as of December 31, 2011 |  |  | 1,685,965 |  | $ | 11.45 - $57.19 |  | $ | 40.22 |  |  | 6.5 |  | $ | 25,158 |
Summary of status of nonvested stock options and changes during the year |
Activity |  | Shares |  | Weighted Average Grant Date Fair Value |
--- | --- | --- | --- | --- | ---
Nonvested at beginning of year |  |  | 340,203 |  | $ | 8.33 |
Granted |  |  | 376,451 |  |  | 11.17 |
Assumed from NHP |  |  | 108,785 |  |  | 9.93 |
Vested |  |  | (464,399 | ) |  | 9.12 |
Forfeited |  |  | — |  |  | — |
Nonvested at end of year |  |  | 361,040 |  | $ | 10.76 |
Summary of status of nonvested restricted stock and restricted stock units and changes during the year |
|  | Restricted Stock |  | Weighted Average Grant Date Fair Value |  | Restricted Stock Units |  | Weighted Average Grant Date Fair Value |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nonvested at December 31, 2010 |  |  | 493,967 |  | $ | 43.10 |  |  | 4,690 |  | $ | 39.28 |
Granted |  |  | 393,764 |  |  | 53.33 |  |  | 2,050 |  |  | 52.48 |
Assumed from NHP |  |  | 1,337 |  |  | 53.74 |  |  | 41,495 |  |  | 53.74 |
Vested |  |  | (281,090 | ) |  | 42.29 |  |  | (14,946 | ) |  | 50.08 |
Forfeited |  |  | (15,780 | ) |  | 51.22 |  |  | — |  |  | — |
Nonvested at December 31, 2011 |  |  | 592,198 |  | $ | 50.09 |  |  | 33,289 |  | $ | 53.27 |

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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 -Topic 718 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (c)(1) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -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 -Topic 718 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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