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Share-Based Compensation And Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2011

Share-Based Compensation And Benefit Plans [Abstract]

Summary Of Stock Option Activity

		Options				Weighted- Average Exercise Price				Weighted- Average Remaining Contractual Term (in years)				Aggregate Intrinsic Value
Options outstanding at January 1, 2011			493,000			$	43.80
Granted			70,000				62.75
Exercised			(126,100	)			37.46
Forfeited			(34,000	)			49.92
Expired			(17,750	)			64.56
Options outstanding at December 31, 2011			385,150			$	47.82				2.76			$	6,892
Options exercisable at December 31, 2011			150,734			$	34.30				1.54			$	4,727

Summary Of Non-Vested (Restricted) Stock Activity

		Shares				Weighted- Average Grant Date Fair Value
Non-vested (restricted) stock outstanding at January 1, 2011			1,872,291			$	31.47
Granted			429,602				63.87
Vested			(9,445	)			50.71
Forfeited			(30,500	)			54.64
Non-vested (restricted) stock outstanding at December 31, 2011			2,261,948			$	37.23

Weighted-Average Assumptions Relating To Valuation Of Our Stock Options

Years Ended December 31,		2011				2010				2009
Expected term in years			4.25				4.25				4.25
Risk-free interest rate			1.12	%			1.14	%			1.96	%
Expected volatility			32.59	%			33.35	%			34.03	%
Expected dividend yield			3.48	%			3.65	%			4.32	%

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- Definition

Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

+ References

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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

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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.

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