Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2012

Summary Of Activity In Corporation's Active Stock Plans

						Non-Vested Stock Awards/Stock Units Outstanding				Stock Options Outstanding
	Shares Available for Grant			Director Deferred Stock Units Outstanding		Number of Shares		Weighted- Average Grant-Date Fair Value		Number of Shares			Weighted- Average Exercise Price
Balance, January 1, 2012		1,963,455			22,092		169,530	$	50.33		4,968,822		$	51.49
Granted		(5,632	)		5,632		—		—		—			—
Stock options exercised		—			—		—		—		(197,961	)		50.98
Stock awards vested		—			—		—		—		—			—
Forfeited		19,000			—		—		—		(19,000	)		50.51
Cancelled/expired		(250	)		—		—		—		—			—
Balance, September 30, 2012		1,976,573			27,724		169,530	$	50.33		4,751,861		$	51.51

Stock-Based Compensation Expense

Stock-based compensation expense is recognized ratably over the requisite service period for all awards. Stock-based compensation expense was as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2012		2011		2012		2011
Stock options	$	2,190	$	2,073	$	6,549	$	6,686
Non-vested stock awards/stock units		354		360		1,063		3,000
Deferred stock units		—		—		330		330
Total	$	2,544	$	2,433	$	7,942	$	10,016

Unrecognized Stock-Based Compensation Expense

Stock options	$	12,267
Non-vested stock awards/stock units		2,033
Total	$	14,300