Share-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2011

Share-based Compensation Expense for Option Grants, Restricted Stock Awards and Restricted Stock Unit Awards

	Three Months Ended June 30,					Six Months Ended June 30,
	2011		2010			2011		2010
Stock options and restricted stock awards	$	1,363	$	1,105		$	3,368	$	2,779
Restricted stock unit awards		148		(41	)		330		112
	$	1,511	$	1,064		$	3,698	$	2,891
Number of shares issued to non-employee directors		2,050		1,956			3,985		4,080

Schedule of Compensation Expenses for Nonvested Share-Based Awards Expected to be Recognized

Remaining six months of 2011	$	3,099
2012		4,586
2013		2,362
2014		132
	$	10,179

Summary of the Stock Options Granted

	Three Months Ended June 30,				Six Months Ended June 30,
	2011		2010		2011		2010
Three year vesting		—		2,700		200,200		238,050
One year vesting		—		—		5,289		—
		—		2,700		205,489		238,050

Schedule of Share-Based Compensation Stock Options Valuation Assumptions

	2011			2010
Risk-free interest rate		2.8	%		2.7	%
Dividend yield		—			—
Volatility factor of Company common stock		0.56			0.58
Weighted-average expected option life (years)		6.0			6.0
Weighted-average grant-date fair value	$	20.01		$	17.23

Weighted-Average Grant-Date Fair Value

	Shares			Weighted Average Fair Value at Grant Date
Non-vested at January 1, 2011		397,914		$	17.07
Granted during the first six months of 2011		205,489		$	20.01
Vested during the first six months of 2011		(183,642	)	$	18.63
Forfeited during the first six months of 2011		(3,284	)	$	17.30
Non-vested at June 30, 2011		416,477		$	18.17
Non-vested at January 1, 2010		337,812		$	18.96
Granted during the first six months of 2010		238,050		$	17.23
Vested during the first six months of 2010		(169,709	)	$	21.10
Forfeited during the first six months of 2010		(7,869	)	$	17.34
Non-vested at June 30, 2010		398,284		$	17.04

Summary of Stock Option Activity

	Shares			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (Years)		Aggregate Intrinsic Value
Outstanding at January 1, 2011		1,071,454		$	36.27
Granted		205,489		$	36.51
Exercised		(5,481	)	$	28.64
Expired unexercised		(1,500	)	$	53.63
Forfeited		(3,284	)	$	31.45
Outstanding at June 30, 2011		1,266,678		$	36.33		6.66	$	10,178
Vested or expected to vest at June 30, 2011		1,235,424		$	36.33		6.61	$	9,949
Exercisable at June 30, 2011		850,201		$	38.35		5.52	$	6,668

Schedule of Cash Payments Received from Exercise of Stock Options and Intrinsic Value of Options

	Three Months Ended June 30,				Six Months Ended June 30,
	2011		2010		2011		2010
Cash proceeds from exercise of stock options	$	141	$	10	$	157	$	3,802
Intrinsic value of options exercised	$	45	$	7	$	47	$	2,063

Schedule of Performance-Based Shares Vested and issued

	Six Months Ended June 30,
	2011			2010
Vested based on meeting performance criteria		1,773			74,676
Shares surrendered to pay withholding taxes		(578	)		(26,651	)
Net shares issued		1,195			48,025

Schedule of Time-Based Shares Vested and Issued

	Six Months Ended June 30,
	2011			2010
Vested - 3 year vesting period		15,575			22,760
Vested - 1 year vesting period		—			4,127
Shares surrendered to pay withholding taxes		(5,023	)		(9,233	)
Net shares issued		10,552			17,654

Restricted Stock Awards [Member]

Summary of Performance-Based Restricted Stock Awards and Stock Unit Awards

	Shares			Weighted Average Grant Date Fair Value
Non-vested at January 1, 2011		253,975		$	32.90
Granted		117,770		$	36.51
Vested		(1,773	)	$	58.57
Forfeited		(54,502	)	$	57.71
Non-vested at June 30, 2011		315,470		$	29.82
Expected to vest at June 30, 2011		93,848

Schedule of Time-Based Restricted Stock Awards and Stock Unit Awards

	Shares			Weighted Average Grant Date Fair Value
Nonvested at January 1, 2011		99,025		$	32.67
Granted - one year vesting		60,825		$	36.51
Granted - three year vesting		2,767		$	36.51
Vested		(15,575	)	$	58.41
Forfeited		(400	)	$	30.66
Nonvested at June 30, 2011		146,642		$	31.61
Expected to vest at June 30, 2011		124,242

Restricted Stock Unit Awards [Member]

Summary of Performance-Based Restricted Stock Awards and Stock Unit Awards

	Units
Non-vested at January 1, 2011		38,530
Granted		17,125
Forfeited		(2,220	)
Non-vested at June 30, 2011		53,435
Expected to vest at June 30, 2011		14,661

Schedule of Time-Based Restricted Stock Awards and Stock Unit Awards

	Units
Nonvested at January 1, 2011		13,850
Granted		9,095
Forfeited		(800	)
Nonvested at June 30, 2011		22,145
Expected to vest at June 30, 2011		20,240