Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2011

Stock-Based Compensation [Abstract]

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, 2011		2,759,347			16,515		227,550		$	51.10		4,383,885		$	52.08
Granted		(5,577	)		5,577		—			—		—			—
Stock options exercised		—			—		—			—		(144,203	)		50.19
Stock awards vested		—			—		(85,420	)		50.64		—			—
Forfeited		54,125			—		—			—		(54,125	)		51.49
Balance, September 30, 2011		2,807,895			22,092		142,130		$	51.38		4,185,557		$	52.15

Stock-Based Compensation Expense

	Three Months Ended September 30,				Nine Months Ended September 30,
	2011		2010		2011		2010
Stock options	$	2,073	$	2,403	$	6,686	$	7,040
Non-vested stock awards/stock units		360		1,019		3,000		3,140
Deferred stock units		—		—		330		300
Total	$	2,433	$	3,422	$	10,016	$	10,480

Unrecognized Stock-Based Compensation

Stock options	$	15,524
Non-vested stock awards/stock units		2,192
Total	$	17,716