Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of Activity for Stock Options Granted

The following table summarizes the activity for stock options granted by the Company:

	Shares			Weighted-Average Exercise Price Per Share		Weighted-Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value (in $000s)
Outstanding at January 1, 2011		561,423		$	14.57		8.38	$	2,588
Granted		735,886			17.61
Exercised		(14,136	)		12.69			$	100
Forfeited or expired		(57	)		10.14
Outstanding at December 31, 2011		1,283,116			16.34		8.51	$	6,042
Granted		800,820			20.56
Exercised		(87,598	)		14.13			$	1,410
Forfeited or expired		(40,539	)		28.33
Outstanding at December 31, 2012		1,955,799			17.92		7.02	$	49,458
Granted		1,050,904			33.79
Exercised		(166,711	)		17.39			$	3,561
Forfeited or expired		(113,439	)		31.33
Outstanding at December 31, 2013		2,726,553		$	23.51		7.22	$	32,785
Exercisable at December 31, 2013		949,998		$	17.02		6.29	$	17,790

Summary of Weighted-Average Assumptions

The fair value of each stock option award was estimated at the grant date using the Black-Scholes option-pricing model. The weighted-average assumptions the Company used to value these awards are shown below.

	For the Years Ended December 31,
	2013			2012			2011
Risk-free interest rate		0.75	%		0.73	%		1.91	%
Dividend yield		0.00	%		0.05	%		0.22	%
Expected life (years)		5.00			4.50			5.00
Volatility		51.45	%		52.66	%		52.28	%
Forfeiture rate		3.14	%		1.40	%		0.00	%

Summary of Activity for Non-Vested Awards Granted

The following table summarizes the activity for non-vested awards granted by the Company:

	Shares			Weighted-Average Grant-Date Fair Value Per Share		Weighted-Average Contractual Term (in years)		Aggregate Intrinsic Value (in 000s)
Outstanding at January 1, 2011		1,102,396		$	9.87		7.86	$	19,777
Granted		708,000		$	24.93
Vested and settled		(43,436	)					$	900
Outstanding at December 31, 2011		1,766,960		$	15.84		5.65	$	36,240
Granted		110,783		$	20.72
Vested and settled		(969,815	)					$	20,189
Forfeited		(92,000	)	$	24.93
Outstanding at December 31, 2012		815,928		$	22.32		3.09	$	35,101
Granted		36,576		$	35.79
Vested and settled		(522,762	)	$	21.16			$	20,922
Forfeited		(21,316	)	$	25.73
Outstanding at December 31, 2013		308,426		$	25.65		1.90	$	10,906