Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2012

Share-Based Compensation [Abstract]

Summary of share-based compensation expense

	2012			2011			2010
	(in thousands)
Restricted stock/PBRS	$	3,267		$	3,042		$	2,821
Performance unit incentive plan (“PUP”)		2,922			714			(3	)
Stock options		593			537			447
Restricted stock units/PBRS units		450			120			253
Total share-based compensation before income tax benefit		7,232			4,413			3,518
Income tax benefit		(2,574	)		(1,594	)		(1,225	)
Total share-based compensation, net of income tax benefit	$	4,658		$	2,819		$	2,293

Summary of restricted stock and PBRS activity

	Restricted Stock					PBRS
				Weighted-Average					Weighted-Average
				Grant Date					Grant Date
	Shares			Fair Value		Shares			Fair Value
Balance at January 1, 2010		390,810		$	24.59		174,927		$	20.77
Granted		157,900			19.30		—			—
Vested		(65,961	)		34.42		(29,547	)		35.31
Cancelled		—			—		(126,550	)		15.36
Forfeited		(4,250	)		22.55		—			—
Balance at December 31, 2010		478,499			21.51		18,830			33.02
Granted		191,850			22.70		—			—
Vested		(91,212	)		31.31		(18,414	)		33.42
Forfeited		(7,115	)		20.81		—			—
Balance at December 31, 2011		572,022			20.36		416			15.36
Granted		168,050			20.46		—			—
Vested		(219,571	)		18.26		(416	)		15.36
Forfeited		(4,150	)		24.80		—			—
Balance at December 31, 2012		516,351			21.25		—			—

Summary of Liability Based Award Activity

	Restricted Stock Units					PBRS Units					PUP Awards
				Weighted-Average					Weighted-Average					Weighted-Average
				Grant Date					Grant Date					Grant Date
	Units			Fair Value		Units			Fair Value		Units			Fair Value
Balance at January 1, 2010		13,700		$	15.36		13,900		$	15.36		102,960		$	33.81
Granted		12,350			19.20		—			—		—			—
Vested		—			—		(1,958	)		15.36		—			—
Cancelled		—			—		(8,028	)		15.36		—			—
Balance at December 31, 2010		26,050			17.18		3,914			15.36		102,960			33.81
Granted		12,550			23.01		—			—		95,500			23.02
Vested		—			—		(1,958	)		15.36		—			—
Cancelled		—			—		—			—		(102,960	)		33.81
Balance at December 31, 2011		38,600			19.07		1,956			15.36		95,500			23.02
Granted		15,850			20.57		—			—		115,100			20.60
Vested		(13,100	)		15.36		(1,956	)		15.36		—			—
Cancelled		(850	)		20.89		—			—		—			—
Balance at December 31, 2012		40,500			20.82		—			—		210,600			21.70

Summary of stock option activity

				Weighted-
				Average		Options
	Shares			Exercise Price		Exercisable
Options outstanding at January 1, 2010		541,718		$	25.74		462,683
Granted		280,900			19.20
Exercised		(22,311	)		23.21
Forfeited or expired		(36,513	)		26.34
Options outstanding at December 31, 2010		763,794			23.38		451,194
Exercised		(14,616	)		20.14
Forfeited or expired		(164,977	)		23.88
Options outstanding at December 31, 2011		584,201			23.32		396,688
Exercised		(12,099	)		19.41
Forfeited or expired		(208,206	)		25.81
Options outstanding at December 31, 2012		363,896			22.03		276,009

Summary of information concerning stock options outstanding and exercisable

	Options Outstanding						Options Exercisable
			Weighted-Average		Weighted-				Weighted-
			Remaining		Average				Average
Range of Exercise Prices	Shares		Contractual Life		Exercise Price		Shares		Exercise Price
$19.20		247,867		7.0 years	$	19.20		166,740	$	19.20
$19.57		43,796		0.3 years		19.57		43,796		19.57
$23.28 to $31.92		29,433		1.1 years		29.43		27,433		29.76
$33.81 to $38.44		42,800		1.7 years		35.86		38,040		36.12
$19.20 to $38.44		363,896		5.1 years		22.03		276,009		22.64

Summary of additional information pertaining to stock options

	2012		2011			2010
	(in thousands)
Total intrinsic value of stock options outstanding	$	2,329	$	—		$	2,341
Total intrinsic value of stock options exercised	$	296	$	325		$	544
Fair value of stock options vested	$	539	$	682		$	404
Cash received from the exercise of stock options	$	248	$	296		$	593
Tax benefits (deficiencies) realized for tax deductions related to stock option exercises and performance-based awards	$	96	$	(325	)	$	(524	)