v2.4.0.6

Stock-Based Compensation (Tables)

12 Months Ended

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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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.

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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

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-Name Accounting Standards Codification

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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

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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.

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