STOCK-BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2013

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

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

A binomial lattice-based valuation model is used to estimate the fair value of each option granted. Because of the limitations with closed-form valuation models, such as the Black-Scholes model, we have determined that this more flexible binomial model provides a better estimate of the fair value of our options. The fair value of each stock option award on the date of the grant was calculated using the following weighted-average assumptions:

	2013			2012			2011
Expected volatility	61.8		%	64.8		%	64.1		%
Risk-free interest rate	2.13		%	1.98		%	3.23		%
Expected life of options	5.5 years			5.8 years			5.2 years
Dividend rate	—			—			—
Fair value of options	$	6.24		$	4.00		$	2.53

Schedule of Share-based Compensation, Stock Options, Activity

Stock option activity for the Equity Compensation Plans through December 31, 2013 was as follows:

	Options		Weighted Average Exercise Price		Aggregate Intrinsic Value (thousands)		Weighted Average Remaining Contractual Life
Balance at December 31, 2012	4,885,215		$	5.97	$	23,463	7.8 years
Granted	1,928,500		$	11.25
Exercised	(517,979	)	$	4.83
Forfeited and expired	(562,915	)	$	8.57
Balance at December 31, 2013	5,732,821		$	7.59	$	6,185	7.7 years
Outstanding options less expected forfeitures at December 31, 2013	5,274,974		$	7.44	$	5,936	7.6 years
Exercisable at December 31, 2013	2,492,009		$	5.84	$	4,362	6.4 years

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range

The following table outlines our outstanding and exercisable stock options as of December 31, 2013:

	Options Outstanding				Options Exercisable
Range of Option Exercise Price	Outstanding Options	Weighted Average Exercise Price		Weighted Average Remaining Contractual Life	Options Exercisable	Weighted Average Exercise Price
$1.71 - $4.24	443,516	$	2.83	5.2 years	411,850	$	2.72
$4.42 - $6.61	1,104,875	$	5.03	6.5 years	768,053	$	5.13
$6.62- $6.65	1,856,582	$	6.63	7.8 years	879,922	$	6.63
$6.67 - $9.16	857,348	$	7.90	7.9 years	432,184	$	8.44
$11.04 - $16.63	1,470,500	$	12.01	9.2 years	—	$	—
All options	5,732,821	$	7.59	7.7 years	2,492,009	$	5.84

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

Restricted stock award activity through December 31, 2013 was as follows:

	Restricted Stock		Weighted Average Award Date Fair Value		Weighted Average Remaining Recognition Period
Balance at December 31, 2012	70,000		$	7.52	0.4 years
Granted	370,000		$	12.31
Awards Vested	(70,000	)	$	7.52
Canceled	—		$	—
Balance at December 31, 2013	370,000		$	12.31	0.3 years

Schedule of Share-based Compensation, Stock Appreciation Rights Award Activity

SAR activity through December 31, 2013 was as follows:

	Stock Appreciation Right		Weighted Average Exercise Price		Weighted Average Remaining Recognition Period
Balance at December 31, 2012	380,000		$	6.72	1.8 years
Granted	—		$	—
Exercised	—		$	—
Canceled	(50,000	)	$	6.67
Balance at December 31, 2013	330,000		$	6.73	1.7 years