Stock-Based Compensation Plans (Tables)

9 Months Ended

Jun. 30, 2011

Summary of Stock Options Issued Pursuant to Stock Incentive Plans

A summary of stock options issued pursuant to the Company’s stock incentive plans is as follows:

	Number of Shares			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (Years)		Aggregate Intrinsic Value  of In-the-Money Options
Outstanding as of December 31, 2010		3,510,538		$	21.55
Granted		70,000			29.00
Exercised		(196,042	)		12.11
Forfeited		(13,737	)		21.15
Outstanding as of June 30, 2011		3,370,759		$	22.25		5.36	$	39,287,115
Exercisable as of June 30, 2011		2,247,684		$	22.14		4.71	$	26,595,661

Fair Value of Options Granted Estimated using the Black-Scholes Option-Pricing Model with Weighted-Average Assumptions

The fair value of options granted during the three and six months ended June 30, 2011 and 2010 was estimated on the date of grant using the Black-Scholes option-pricing model, a pricing model acceptable under U.S. GAAP, with the following weighted-average assumptions:

		September 30,			September 30,			September 30,			September 30,
	Three Months Ended			Six Months Ended			Three Months Ended			Six Months Ended
	June 30, 2011			June 30, 2011			June 30, 2010			June 30, 2010
Expected life (years)		5.50			5.50			5.50			5.63
Interest rate		1.6	%		1.6	%		2.0	%		2.3	%
Volatility		50.8	%		50.8	%		51.8	%		51.7	%
Dividend yield		—			—			—

Summary of Nonvested Long-Term Incentive Program Performance Share Awards ("LTIP performance shares") Outstanding

A summary of nonvested long-term incentive program performance share awards (“LTIP performance shares”) outstanding as of June 30, 2011 and changes during the period are as follows:

		September 30,			September 30,
Nonvested LTIP Performance Shares	Number of Shares at Expected Attainment			Weighted- Average Grant Date Fair Value
Nonvested as of December 31, 2010		499,035		$	20.57
Forfeited		(15,520	)		19.77
Nonvested as of June 30, 2011		483,515		$	20.60

Summary of Nonvested Restricted Share Awards ("RSAs") and Changes During the Period

A summary of nonvested restricted share awards (“RSAs”) as of June 30, 2011 and changes during the period are as follows:

		September 30,			September 30,
Nonvested Restricted Share Awards	Number  of Restricted Share Awards			Weighted-Average  Grant Date Fair Value
Nonvested as of December 31, 2010		192,298		$	18.42
Awarded		1,300			29.00
Vested		(43,001	)		16.61
Forfeited		(9,000	)		17.36
Nonvested as of June 30, 2011		141,597		$	19.14