Equity Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2015

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Fair Value of Each Stock Option Granted Weighted-Average Assumptions

The fair value of each stock option granted was estimated using the following weighted-average assumptions:

	Year Ended			Year Ended			Year Ended
	December 31,			December 31,			December 31,
	2015			2014			2013
Fair value of options granted	$	4.10		$	3.26		$	1.69
Expected volatility		84	%		117	%		91	%
Risk-free interest rate		1.6	%		2.0	%		1.3	%
Expected lives		6.0 years			6.1 years			7.0 years
Dividend rate		1.6%			2.3%			—

Summary of Stock Option Activity

The following is a summary of stock option activity: (in thousands, except exercise price data and contractual life data):

Options	Number of Shares			Weighted-Average Exercise Price		Weighted-Average Remaining Contractual Life (Years)		Aggregate Intrinsic Value
Outstanding at December 31, 2012		8,207		$	4.55
Granted		2,815		$	2.18
Exercised		(1,683	)		1.67			$	4,965
Forfeited or cancelled		(1,622	)		5.70
Outstanding at December 31, 2013		7,717		$	4.05			$	22,023
Granted		350		$	4.40
Exercised		(1,042	)		1.77			$	5,036
Forfeited or cancelled		(1,470	)		8.53
Outstanding at December 31, 2014		5,555		$	3.33			$	19,015
Granted		75		$	6.45
Exercised		(966	)		2.23			$	4,954
Forfeited or cancelled		(1,241	)		7.07
Outstanding at December 31, 2015		3,423		$	2.35		6.74	$	18,341
Vested and Exercisable at December 31, 2015		1,626		$	2.28		6.17	$	8,828
Vested and Expected to Vest at December 31, 2015		2,868		$	2.37		7.08	$	15,329

Summary of Nonvested Restricted Stock and Restricted Stock Units Activity

The following is a summary of nonvested restricted stock and restricted stock units activity: (in thousands, except grant date fair value data):

	Number of Shares			Weighted-Average Grant Date Fair Value
Nonvested balance at December 31, 2012		1,015		$	2.43
Vested		(487	)		2.16
Forfeited or cancelled		(34	)		1.78
Nonvested balance at December 31, 2013		494		$	2.73
Granted		1,181			4.51
Vested		(489	)		3.38
Forfeited or cancelled		(17	)		2.53
Nonvested balance at December 31, 2014		1,169		$	4.15
Granted		764			8.25
Vested		(614	)		4.91
Forfeited or cancelled		(51	)		4.52
Nonvested balance at December 31, 2015		1,268		$	6.39