Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2013

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Assumptions Used to Estimate Fair Value of Each SAR

The fair value of each stock option award and SAR is estimated on the date of grant using a Black-Scholes option-pricing model. For SARs issued in the years ended December 31, 2013, 2012 and 2011, respectively, the assumptions shown in the following table were used:

	Year Ended December 31,
	2013			2012			2011
Dividend yield		0	%		0	%		0	%
Average risk-free interest rate		0.7	%		0.8	%		2.0	%
Expected term (years)		5			5			5
Volatility		63.7	%		65.9	%		65.0	%

Stock Option Activity

Stock option activity under the Plan and a predecessor stock incentive plan is as follows:

	Options			Weighted- Average Exercise Price Per Share		Weighted- Average Remaining Contractual Life (Years)		Aggregate Intrinsic Value as of December 31, 2013
Outstanding at December 31, 2010		222,446		$	33.20
Granted		—		$	—
Exercised		(57,027	)	$	27.94
Canceled		(20,350	)	$	31.71
Outstanding at December 31, 2011		145,069		$	38.08
Granted		—		$	—
Exercised		(23,189	)	$	31.35
Canceled		(1,242	)	$	20.00
Outstanding at December 31, 2012		120,638		$	40.37
Granted		—		$	—
Exercised		(93,484	)	$	49.83
Canceled		(6,010	)	$	36.31
Outstanding at December 31, 2013		21,144		$	40.09		1.0	$	833,948
Vested at December 31, 2013		21,144		$	40.09		1.0	$	833,948
Exercisable at December 31, 2013		21,144		$	40.09		1.0	$	833,948

SAR Activity

SAR activity under the Plan is as follows:

	SARs			Weighted- Average Grant Price Per Share		Weighted- Average Remaining Contractual Life (Years)		Aggregate Intrinsic Value as of December 31, 2013
Outstanding at December 31, 2010		1,246,495		$	13.70
Granted		96,765		$	25.76
Exercised		(180,555	)	$	28.34
Canceled		—		$	—
Outstanding at December 31, 2011		1,162,705		$	13.17
Granted		100,914		$	25.75
Exercised		(567,953	)	$	13.08
Canceled		(8,476	)	$	24.15
Outstanding at December 31, 2012		687,190		$	18.56
Granted		60,588		$	43.89
Exercised		(374,667	)	$	15.39
Canceled		(3,514	)	$	26.20
Outstanding at December 31, 2013		369,597		$	25.85		6.9	$	2,547,706
Vested at December 31, 2013		230,604		$	21.37		6.0	$	1,386,104
Exercisable at December 31, 2013		230,604		$	21.37		6.0	$	1,386,104

Restricted Stock Activity

Restricted stock activity under the Plan is as follows:

	Restricted Stock			Weighted-Average Grant Price Per Share
Nonvested at December 31, 2010		244,436		$	13.65
Granted		67,945		$	25.86
Vested		(151,706	)	$	27.06
Forfeited		(500	)	$	17.41
Nonvested at December 31, 2011		160,175		$	22.99
Granted		156,927		$	27.18
Vested		(94,705	)	$	26.88
Forfeited		(7,712	)	$	25.47
Nonvested at December 31, 2012		214,685		$	24.16
Granted		47,015		$	44.42
Vested		(69,797	)	$	44.55
Forfeited		(416	)	$	32.32
Nonvested at December 31, 2013		191,487		$	27.56