Equity Incentive Plans (Tables)

3 Months Ended

Mar. 31, 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	(49,597	)	18.18		—	36.56		18.65
Granted	76,617		45.20		—	45.78		45.24
Forfeited	(338	)	18.18		—	46.69		38.89
Outstanding at March 31, 2012	1,029,515		$	18.18	—	$	65.50	$	35.97

Summary Of Outstanding Options

The following table summarizes outstanding options at March 31, 2012:

Exercise price range	Options outstanding	Weighted avg. life remaining	Weighted avg. exercise price		Aggregate intrinsic value  (in thousands)
$ 18.18 - 19.99	262,434	6.8
20.00 - 29.99	172,304	0.9
30.00 - 39.99	94,913	3.8
40.00 - 49.99	386,511	6.3
50.00 - 59.99	10,000	6.1
60.00 - 65.50	103,353	4.8
	1,029,515	5.2	$	35.97	$	12,709

Summary Of Exercisable Options

The following table summarizes exercisable options at March 31, 2012:

Exercise price range	Options outstanding	Weighted avg. life  remaining	Weighted avg. exercise price		Aggregate  intrinsic value (in thousands)
$ 18.18 - 19.99	149,923	6.9
20.00 - 29.99	172,304	0.9
30.00 - 39.99	77,705	2.9
40.00 - 49.99	240,771	4.7
50.00 - 59.99	10,000	6.1
60.00 - 65.50	101,353	4.8
	752,056	4.1	$	36.60	$	9,294

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	(170,881	)	35.84
Forfeited	(185	)	$	41.33
Outstanding at March 31, 2012	327,892		$	42.49	1.63

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	—	—
Vested	—	—
Outstanding at March 31, 2012	10,519	$	47.77	0.10