Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2011

Stock-Based Compensation

Summary of Stock Plan Activity

						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		41,625			—		—			—		(41,625	)		51.45
Balance, June 30, 2011		2,795,395			22,092		142,130		$	51.38		4,198,057		$	52.15

Stock-Based Compensation Expense

	Three Months Ended June 30,				Six Months Ended June 30,
	2011		2010		2011		2010
Stock options	$	2,303	$	2,091	$	4,613	$	4,637
Non-vested stock awards/stock units		1,213		1,019		2,640		2,121
Deferred stock units		330		300		330		300
Total	$	3,846	$	3,410	$	7,583	$	7,058

Unrecognized Stock-Based Compensation

Stock options	$	17,756
Non-vested stock awards/stock units		2,552
Total	$	20,308