Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2011

Compensation Plans

Summary of the option activity

	Shares Under Options			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (Years)		Aggregate Intrinsic Value
Outstanding as of December 31, 2010		7,126		$	27.69		6.7	$	66,073
Granted		710			36.96
Exercised		(1,157	)		26.61
Forfeited		(155	)		33.32
Outstanding as of December 31, 2011		6,524			28.76		6.1		84,169
Exercisable as of December 31, 2011		3,239			28.60		4.7		42,309

Summary additional information concerning outstanding and exercisable stock options

							Currently Exercisable
					Weighted Average Remaining Contractual Term (Years)
Range of Exercise Price	Shares Under Options		Weighted Average Exercise Price				Shares Under Options		Weighted Average Exercise Price
$23.34 - $25.52		2,327	$	23.81		6.1		1,032	$	24.41
27.11 - 28.35		1,960		27.74		5.3		1,245		27.39
31.95 - 39.72		2,237		34.80		6.7		962		34.66
		6,524		28.76		6.1		3,239		28.60

Summary of additional information concerning unvested stock options

	Shares Under Options			Weighted Average Grant Date Fair Value
Unvested at December 31, 2010		3,889		$	3.24
Granted		710			5.97
Vested		(1,159	)		3.10
Forfeited		(155	)		5.54
Unvested at December 31, 2011		3,285			3.77

Assumptions used for estimating fair value of stock options using Black-Scholes option valuation model

	2011			2010			2009
Risk-free rate		2.58	%		2.77	%		2.27	%
Expected life (in years)		6.5			6.3			6.5
Expected volatility		31.8	%		35.0	%		26.0	%
Expected dividend yield		6.1	%		6.2	%		7.3	%

Summary of additional information concerning restricted stock and restricted stock units

	Restricted Stock Units			Weighted Average Grant Date Fair Value		Restricted Shares			Weighted Average Grant Date Fair Value
Unvested at December 31, 2010		1,026		$	29.71		536		$	28.08
Granted		764			37.22		—			N/A
Vested		(228	)		29.46		(162	)		28.91
Forfeited		(84	)		34.51		(35	)		27.61
Unvested at December 31, 2011		1,478			32.59		339			27.75