Stock-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2011

Summary of Stock Options Issued under Various Stock Incentive Plans

A summary of stock options issued under the various Stock Incentive Plans previously described and changes is as follows:

		September 30,			September 30,		September 30,		September 30,
	Number of Shares			Weighted- Average Exercise Price ($)		Weighted- Average Remaining Contractual Term (Years)		Aggregate Intrinsic Value of In-the-Money Options ($)
Outstanding, December 31, 2008		3,428,297		$	21.69
Granted		505,183			16.17
Exercised		(150,134	)		12.06
Forfeited		(125,606	)		31.98
Expired		(100,867	)		29.82
Outstanding, December 31, 2009		3,556,873			20.72
Granted		338,950			24.48
Exercised		(235,986	)		13.34
Forfeited		(106,625	)		18.11
Expired		(42,674	)		30.31
Outstanding, December 31, 2010		3,510,538			21.55
Granted		367,202			28.95
Exercised		(361,093	)		12.40
Forfeited		(26,591	)		20.53
Outstanding, December 31, 2011		3,490,056		$	23.28		5.37	$	21,943,485
Exercisable, December 31, 2011		2,289,018		$	22.88		4.62	$	16,297,256

Weighted-Average Assumptions used to Estimate Fair Value of Options Granted using Black-Scholes Option-Pricing Model

The fair value of options granted in the respective fiscal years was estimated on the date of grant using the Black-Scholes option-pricing model, a pricing model acceptable under ASC 718, with the following weighted-average assumptions:

		September 30,			September 30,			September 30,
	Years Ended December 31,
	2011			2010			2009
Expected life (years)		5.9			5.9			6.0
Risk-free interest rate		1.4	%		2.3	%		3.0	%
Expected volatility		50.6	%		50.8	%		53.2	%
Expected dividend yield		—			—			—

Summary of Nonvested LTIP Performance Shares

A summary of the nonvested LTIP Performance Shares is as follows:

		September 30,			September 30,
	Number of			Weighted-
	Shares at			Average
	Expected			Grant Date
Nonvested LTIP Performance Shares	Attainment			Fair Value
Nonvested at December 31, 2008		—		$	—
Granted		216,150			16.52
Nonvested at December 31, 2009		216,150			16.52
Granted		207,180			26.29
Forfeited or expired		(25,620	)		16.52
Change in expected attainment for 2009 grants		101,325			16.52
Nonvested at December 31, 2010		499,035			20.57
Granted		237,751			28.94
Forfeited or expired		(36,682	)		18.92
Change in expected attainment for 2009 and 2010 grants		231,468			22.71
Nonvested at December 31, 2011		931,571		$	23.33

Summary of Nonvested RSAs

A summary of nonvested RSAs are as follows:

		September 30,			September 30,
	Restricted			Grant Date
Nonvested Restricted Share Awards	Share Awards			Fair Value
Nonvested at December 31, 2008		462,400		$	17.97
Granted		23,500			16.65
Vested		(115,602	)		17.97
Forfeited or expired		(55,750	)		17.54
Nonvested at December 31, 2009		314,548			17.94
Granted		25,950			22.19
Vested		(95,014	)		17.81
Forfeited or expired		(53,186	)		18.52
Nonvested at December 31, 2010		192,298			18.42
Granted		6,300			28.95
Vested		(86,325	)		18.31
Forfeited or expired		(12,250	)		17.52
Nonvested at December 31, 2011		100,023		$	19.29