Common Stock (Tables)

12 Months Ended

Dec. 31, 2011

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Expense, Deferred Tax Benefit, and Current Tax Expense Related to Restricted Stock Awards

The expense, deferred tax benefit, and current tax expense recognized related to restricted stock awards in 2011, 2010 and 2009 is presented below (in thousands):

	2011			2010			2009
Expense	$	2,258		$	1,589		$	1,537
Deferred tax benefit	790			556			538
Current tax expense (benefit) recognized (a)	(518		)	(169		)	134

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(a) Any capitalized costs related to these expenses would be less than $0.1 million for all years.

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity

The aggregate intrinsic value and fair value at grant date of restricted stock which vested in 2011, 2010 and 2009 is presented below (in thousands):

	2011		2010		2009
Aggregated intrinsic value	$	3,279	$	1,749	$	1,331
Fair value at grant date	1,799		1,265		1,714

Schedule of Nonvested Restricted Stock Units Activity

The unvested restricted stock transactions for 2011 are presented below:

	Total Shares		Weighted Average Grant Date Fair Value		Unrecognized Compensation Expense (a)		Aggregate Intrinsic Value
					(In thousands)		(In thousands)
Restricted shares outstanding at December 31, 2010	143,371		$	18.30
Restricted stock awards	118,110		28.98
Lapsed restrictions and vesting	(103,096	)	17.45
Forfeitures	(2,200	)	23.20
Restricted shares outstanding at December 31, 2011	156,185		26.87		$	2,136	$	5,410

_______________________

(a) The unrecognized compensation expense is expected to be recognized over the weighted average remaining contractual term of the outstanding restricted stock of approximately two years.

Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value

The weighted average fair values per share at grant date for restricted stock awarded during 2011, 2010 and 2009 were:

	2011		2010		2009
Weighted average fair value per share	$	28.98	$	20.03	$	14.59

Schedule of Earnings Per Share, Basic and Diluted

The Company awards unvested restricted stock which qualifies as a participating security. The basic and diluted earnings per share are presented below:

	Years Ended December 31,
	2011			2010			2009
Weighted average number of common shares outstanding:
Basic number of common shares outstanding	41,349,883			43,129,735			44,524,146
Dilutive effect of unvested performance awards	206,658			101,780			27,876
Dilutive effect of stock options	30,518			62,904			43,045
Diluted number of common shares outstanding	41,587,059			43,294,419			44,595,067
Basic net income per common share:
Net income	$	103,539		$	100,603		$	66,933
Income allocated to participating restricted stock	(471		)	(403		)	(240		)
Net income available to common shareholders	$	103,068		$	100,200		$	66,693
Diluted net income per common share:
Net income	$	103,539		$	100,603		$	66,933
Income reallocated to participating restricted stock	(469		)	(401		)	(240		)
Net income available to common shareholders	$	103,070		$	100,202		$	66,693
Basic net income per common share:
Distributed earnings	$	0.66		$	—		$	—
Undistributed earnings	1.83			2.32			1.50
Basic net income per common share	$	2.49		$	2.32		$	1.50
Diluted net income per common share:
Distributed earnings	$	0.66		$	—		$	—
Undistributed earnings	1.82			2.31			1.50
Diluted net income per common share	$	2.48		$	2.31		$	1.50

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

The amount of restricted stock awards, performance shares and stock options excluded from the calculation of the diluted number of common shares outstanding because their effect was antidilutive is presented below:

	Year Ended December 31,
	2011	2010	2009
Restricted stock awards	81,653	75,270	66,628
Performance shares (a)	—	24,225	161,842
Stock options	—	—	53,610

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(a) Performance shares were excluded from the computation of diluted earnings per share as no payouts would have been required based upon performance at the end of each corresponding period. These amounts assume a 100% performance level payout

Stock Options

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Disclosure of Share-based Compensation Arrangements by Share-based Payment Award

The following table summarizes the transactions in the Company’s stock options for 2011:

	Shares	Weighted Average Exercise Price		Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value		Cash Received		Realized Current Tax Benefits
					(In thousands)		(In thousands)		(In thousands)
Options outstanding at December 31, 2010	101,246	$	12.82
Options exercised	53,910	12.83					$	692	$	327
Options outstanding at December 31, 2011	47,336	12.80		0.99	$	1,034
Exercisable at December 31, 2011	47,336	12.80		0.99	1,034

Performance Shares

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Disclosure of Share-based Compensation Arrangements by Share-based Payment Award

The outstanding performance share awards at the 100% performance level is summarized below:

	Number Outstanding		Weighted Average Grant Date Fair Value		Unrecognized Compensation Expense (a) (in thousands)		Aggregate Intrinsic Value (in thousands)
Performance shares outstanding at December 31, 2010	219,800		$	15.86
Performance share awards	112,164		23.45
Performance shares vested	(36,350	)	17.27
Performance shares lapsed	—		—
Performance shares forfeited	—		—
Performance shares outstanding at December 31, 2011	295,614		18.57		$	1,825	$	10,240

_______________________

(a) The unrecognized compensation expense is expected to be recognized over the weighted average remaining contractual term of the awards of approximately one year.

Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Performance-Based Units, Vested and Expected to Vest

Detail of performance shares vested follows:

Date Vested	Payout Ratio		Performance Shares Awarded	Compensation Costs Expensed		Compensation Costs Expensed Period	Aggregated Intrinsic Value
				(In thousands)			(In thousands)
January 1, 2012	175.0	%	174,038	$	1,193	2009-2011	$	6,029
July 9, 2011	112.5	%	2,250	23		2008-2011	75
September 3, 2011	112.5	%	3,825	40		2008-2011	129
January 1, 2011	112.5	%	34,820	565		2008-2010	959
January 1, 2010	30.0	%	9,525	662		2007-2009	193

Schedule of Share-based Compensation, Activity

A summary of information related to performance shares for 2011, 2010 and 2009 is presented below:

	2011		2010		2009
Weighted average per share grant date fair value per share of performance shares awarded	$	23.45	$	19.82	$	12.00
Fair value of performance shares vested (in thousands)	628		663		—
Intrinsic value of performance shares vested (in thousands)	1,032		193		—
Compensation expense (in thousands) (a)	1,573		988		727
Deferred tax expense related to compensation expense (in thousands)	551		346		254

_____________________

(a) Includes cumulative adjustments for forfeiture of performance share awards by certain executives.

Repurchase of Equity

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Treasury Stock by Class [Table Text Block]

Detail regarding the Company's stock repurchase program are presented below:

	Since 1999 (a)		Twelve Months Ended December 31,		Authorized Shares
Shares repurchased	25,406,184		2,782,455
Cost, including commission (in thousands)	$	423,647	$	86,508
2010 Plan balance at December 31, 2010					676,271
2011 Plan repurchase shares authorized (b)					2,500,000
Total remaining shares available for repurchase at December 31, 2011					393,816

______________________

(a) Represents repurchased shares and cost since inception of the stock repurchase program in 1999.

(b) On March 21, 2011, the Board of Directors authorized an additional repurchase of the Company’s common stock (the “2011 Plan”).