Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2011

Stock-Based Compensation [Abstract]

Assumption used for the grants

The following table illustrates the valuation assumptions used for the 2011, 2010 and 2009 grants:

	2011			2010			2009
Expected volatility		49 - 50	%		46 - 68	%		38 - 66	%
Weighted-average expected volatility		49	%		46	%		39	%
Expected dividend yield		1.7 - 1.8	%		1.9 - 2.5	%		2.0 - 4.7	%
Weighted-average expected dividend yield		1.8	%		2.4	%		4.7	%
Expected term, in years		6			1 - 6			2 - 6
Risk-free interest rate		1.3 - 2.5	%		0.4 - 2.9	%		1.1 - 2.8	%

Stock options and SARs activity

The following table summarizes the activity during the year ended December 31, 2011 for stock option and SARs awards:

	Shares			Weighted-Average Exercise Price
Outstanding at beginning of year		1,402,452		$	17.74
Granted		153,936			40.28
Exercised		(242,597	)		17.51
Forfeited		(44,871	)		20.87
Outstanding at end of year		1,268,920		$	20.40
Exercisable at end of year		694,872		$	17.51

Nonvested restricted shares activity

The following table summarizes the activity during the year ended December 31, 2011, for nonvested restricted share awards:

	Shares			Weighted-Average Grant Date Fair Value
Nonvested at beginning of year		145,641		$	24.50
Granted		29,365			40.43
Vested		(18,152	)		35.83
Forfeited		(6,773	)		21.19
Nonvested at end of year		150,081		$	26.39