Equity Incentive Plans (Tables)

6 Months Ended

Jun. 30, 2012

Share-based Compensation [Abstract]

Summary Of Share Option Activity

A summary of the Company’s share option activity and related information is as follows:

	Number of shares		Option price per share					Weighted avg. exercise price
Outstanding at December 31, 2011	1,002,833		$	18.18	—	$	65.50	$	34.41
Exercised	(53,430	)	18.18		—	36.56		18.91
Granted	103,082		44.62		—	47.99		45.60
Forfeited	(396	)	18.18		—	46.69		40.03
Outstanding at June 30, 2012	1,052,089		$	18.18	—	$	65.50	$	36.29

Summary Of Outstanding Options

The following table summarizes outstanding options at June 30, 2012:

Exercise price range	Options outstanding	Weighted avg. life remaining	Weighted avg. exercise price		Aggregate intrinsic value  (in thousands)
$ 18.18 - 19.99	261,934	6.6
20.00 - 29.99	168,971	0.7
30.00 - 39.99	94,913	3.6
40.00 - 49.99	412,918	6.3
50.00 - 59.99	10,000	5.9
60.00 - 65.50	103,353	4.6
	1,052,089	5.1	$	36.29	$	9,047

Summary Of Exercisable Options

The following table summarizes exercisable options at June 30, 2012:

Exercise price range	Options outstanding	Weighted avg. life  remaining	Weighted avg. exercise price		Aggregate  intrinsic value (in thousands)
$ 18.18 - 19.99	161,923	6.3
20.00 - 29.99	168,971	0.7
30.00 - 39.99	78,955	2.8
40.00 - 49.99	247,488	4.5
50.00 - 59.99	10,000	5.9
60.00 - 65.50	103,353	4.6
	770,690	4.0	$	36.55	$	6,700

Summary Of Nonvested Share Activity

A summary of the Company’s nonvested share activity and related information is as follows:

	Number  of shares		Weighted avg. grant  date fair value		Weighted avg. life remaining
Outstanding at December 31, 2011	350,863		$	38.11
Granted	148,095		45.20
Vested	(175,965	)	35.97
Forfeited	(185	)	$	41.33
Outstanding at June 30, 2012	322,808		$	42.52	1.38

Summary Of Restricted Share Unit Activity

A summary of the Company’s restricted share unit activity and related information is as follows:

	Number  of Shares		Weighted Average Grant Date Fair Value		Weighted Average Life Remaining
Outstanding at December 31, 2011	10,519		$	47.77
Granted	10,925		44.62
Vested	(10,519	)	47.77
Outstanding at June 30, 2012	10,925		$	44.62	0.86