Equity Incentive Compensation Plans (Tables)

3 Months Ended

Mar. 31, 2012

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of stock options or units activity

	Number of Shares		Weighted Average Exercise Price		Aggregate Intrinsic Value (in thousands)(1)		Number of Shares Exercisable
Outstanding at January 1, 2012	1,520,689		$	30.32	$	17,798	1,434,020
Granted	82,262		53.02		—		—
Exercised	(197,209	)	17.73		6,779		—
Cancelled/expired	—		—		—		—
Outstanding at March 31, 2012	1,405,742		$	33.41	$	20,317	1,257,883

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(1) The intrinsic value of a stock option is the amount by which the market value of the underlying stock at the end of the related period exceeds the exercise price of the option.

Summary of assumptions to estimate fair value of stock options

	2012
Expected volatility	50.00	%
Risk-free interest rate	0.95	%
Dividend yield	0.57	%
Expected term (in years)	5.2

Summary of restricted stock units activity

	RSUs		Weighted Average Grant Date Fair Value		Vest Date Fair Value (in thousands)
Outstanding at January 1, 2012	915,022		$	23.88
Granted	143,601		52.08
Issued	(49,706	)	43.23		$	2,406
Canceled/expired	(4,490	)	25.13
Outstanding at March 31, 2012(1)(2)	1,004,427		$	26.74

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(1) The balance outstanding includes 43,554 RSUs granted to the non-employee Directors that are 100% vested at date of grant, but are subject to deferral elections delaying the date on which the corresponding shares are issued.

(2) The balance outstanding includes 469,165 RSUs granted to executive officers and other officers that have vested in accordance with the RSU agreement, but are subject to deferral elections delaying the date on which the corresponding shares are issued.

Summary of performance share awards activity

	Performance Share Awards (1)	Weighted Average Grant Date Fair Value		Vest Date Fair Value (in thousands)
Outstanding at January 1, 2012	162,849	$	39.00
Granted	59,738	63.69
Issued	—	—		$	—
Canceled/expired	—	—
Outstanding at March 31, 2012	222,587	$	45.79

Summary of assumptions used in valuing market-based restricted shares

	2012
Number of simulations	100,000
Expected volatility	50	%
Risk-free interest rate	0.42	%