Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2011

Share-Based Compensation [Abstract]

Summary of transaction involving stock options

The following table summarizes the transactions involving the stock option plans:

				Weighted-		Weighted-
(in thousands				Average		Average		Aggregate
except exercise				Exercise		Remaining		Intrinsic
price and life)	Options			Price		Life (Years)		Value
Outstanding at December 31, 2008		1,450		$	21.17		5.0	$	4,110
Exercised		(502	)		19.34
Cancelled		(38	)		22.58
Outstanding at December 31, 2009		910			22.13		4.4		3,852
Exercised		(582	)		22.16
Outstanding at December 31, 2010		328			22.06		3.9		4,807
Exercised		(121	)		21.55
Outstanding at December 31, 2011		207		$	22.36		3.1	$	3,222
Exercisable at December 31, 2011		207		$	22.36		3.1	$	3,222

Summary of information concerning outstanding and exercisable stock options

The following table summarizes information concerning outstanding and exercisable stock options at December 31, 2011:

	Range of Exercise Price
(in thousands except life and exercise price)	$	18.57-20.06	$	20.07-22.99	$	23.00-30.07
Options outstanding		50		38		119
Weighted-average remaining contractual life, in years		2.8		2.7		3.4
Weighted-average exercise price	$	19.11	$	20.63	$	24.29
Options exercisable		50		38		119
Weighted-average exercise price	$	19.11	$	20.63	$	24.29

Summary of nonvested stock activity

The following table summarizes the nonvested stock activity:

				Grant Date
				Weighted-		Aggregate
(in thousands				Average		Intrinsic
except fair value)	Shares			Fair Value		Value
Outstanding at December 31, 2008		454		$	24.42	$	10,847
Granted		235			24.78
Vested		(131	)		24.66
Cancelled		(134	)		24.76
Outstanding at December 31, 2009		424			24.44		11,142
Granted		265			34.45
Vested		(259	)		27.92
Cancelled		(67	)		24.79
Outstanding at December 31, 2010		363			29.20		13,340
Granted		270			35.48
Vested		(175	)		34.04
Cancelled		(58	)		28.45
Outstanding at December 31, 2011		400		$	31.42	$	15,142