Employee Stock and Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2013

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

Schedule of Total Stock-based Compensation Expense

Stock-based compensation expense recognized in our consolidated statements of operations includes amounts related to stock options, restricted stock, and employee stock purchase plans and was as follows (in thousands):

	Years Ended December 31,
	2013		2012		2011
Total stock-based compensation expense	$	7,468	$	8,123	$	11,747

Weighted-Average Assumptions Used to Determine Fair Value of Options Granted

The fair value of options granted was determined using the Black-Scholes model and used the following weighted average assumptions:

	Years Ended December 31,
	2013		2012		2011
Expected dividend yield	—	%	—	%	—	%
Risk-free interest rate	0.86	%	0.50	%	1.31	%
Expected term (years)	4.3		4.2		4.0
Volatility	48	%	58	%	54	%

Schedule of Nonvested Restricted Stock Units Activity

Restricted stock unit and award activity was as follows (shares are in thousands):

	Shares		Weighted Average Grant Date Fair Value Per Share		Total Grant Date Fair Value of Vested Awards (000's)
Nonvested shares, December 31, 2010	87		$	12.04
Granted	520		9.40
Vested	(94	)	11.58		$	1,078
Forfeited/Canceled	(50	)	9.59
Nonvested shares, December 31, 2011	463		$	9.42
Granted	1,536		8.70
Vested	(437	)	9.47		$	4,106
Forfeited/Canceled	(313	)	9.42
Nonvested shares, December 31, 2012	1,249		$	8.52
Granted	232		7.18
Vested	(581	)	9.13		$	4,438
Forfeited/Canceled	(410	)	7.74
Nonvested shares, December 31, 2013	490		$	7.80

Schedule of Stock Options and Restricted Stock Units Activity

Stock option activity (shares are in thousands):

	Options Outstanding				Weighted Average Grant Date Fair Value
	Number of Shares		Weighted Average Exercise Price
Outstanding, December 31, 2010	5,559		$	19.68
Options granted at common stock price	2,250		9.54		$	5.08
Options exercised	(210	)	10.57
Options cancelled	(1,234	)	14.72
Outstanding, December 31, 2011	6,365		$	14.24
Options granted at common stock price	1,422		8.29		$	3.71
Options exercised	(466	)	6.61
Options cancelled	(2,787	)	12.76
Outstanding, December 31, 2012	4,534		$	14.07
Options granted at common stock price	3,578		7.56		$	2.93
Options exercised	(24	)	5.56
Options cancelled	(1,463	)	15.76
Outstanding, December 31, 2013	6,625		$	10.21
Exercisable, December 31, 2013	2,293		$	14.82
Vested and expected to vest, December 31, 2013	5,353		$	10.81