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Equity Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions The assumptions used in estimating the fair value of the stock options granted during the period, along with the weighted-average grant date fair values, were as follows:
 
 
2019
 
2018
 
2017
Expected volatility
 
56.5%
 
—%
 
49.5%
Expected life (in years)
 
6.3
 
0
 
4.8
Risk-free interest rate
 
2.3%
 
—%
 
1.7%
Dividend yield
 
—
 
N/A
 
—
Weighted-average grant date fair value per stock option
 
$2.33
 
N/A
 
$9.25
Forfeiture rate
 
8.0%
 
—%
 
8.0%
Schedule of Share-based Compensation, Activity
The table below sets forth a summary of stock option activity within the Company’s stock-based compensation plans for the years ended December 31, 2019, 2018 and 2017:
 
 
 
 
 
 
Number of
Shares
(in thousands)
 
 
Weighted
Average
Exercise Price
 
Weighted Average Remaining Contractual Term (Years)
 
Aggregate
Intrinsic Value
(in thousands) (1)
Outstanding at December 31, 2016
 
4,766

 
$
27.27

 
 
 
 

Granted
 
66

 
21.28

 
 
 
 

Exercised
 
(623
)
 
15.53

 
 
 
 

Forfeited or expired
 
(156
)
 
28.2

 
 
 
 

Outstanding at December 31, 2017
 
4,053

 
$
28.95

 
 
 
 

Granted
 
—

 
—

 
 
 
 

Exercised
 
(22
)
 
24.99

 
 
 
 

Forfeited or expired
 
(613
)
 
31.28

 
 
 
 

Outstanding at December 31, 2018
 
3,418

 
$
28.55

 
 
 
 

Granted
 
3,237

 
4.24

 
 
 
 

Exercised
 
—

 
—

 
 
 
 

Forfeited or expired
 
(1,451
)
 
25.31

 
 
 
 

Outstanding at December 31, 2019
 
5,204

 
$
14.33

 
6.8
 
$
—

Exercisable at December 31, 2019
 
1,808

 
$
30.20

 
3.0
 
$
—



(1)
Includes only those options that were in-the-money as of December 31, 2019. Stock options for which the exercise price exceeded the market price have been omitted. Fluctuations in the intrinsic value of both outstanding and exercisable options may result from changes in underlying stock price and the timing and volume of option grants, exercises and forfeitures.
Schedule of Nonvested Restricted Stock Units Activity
Set forth below is a summary of unvested RSU activity for the three years ended December 31, 2019, 2018 and 2017:
 
Number of Shares
(in thousands)
 
Weighted Average per Share
Grant Date Fair Value
Unvested at December 31, 2016
416

 
$
31.52

Granted
666

 
33.10

Vested
(137
)
 
32.55

Forfeited
(57
)
 
31.34

Unvested at December 31, 2017
888

 
$
32.55

Granted (1)
1,711

 
16.07

Vested
(408
)
 
30.22

Forfeited (1)
(548
)
 
24.00

Unvested at December 31, 2018
1,643

 
$
19.85

Granted
4,432

 
4.10

Vested
(631
)
 
24.10

Forfeited
(370
)
 
14.11

Unvested at December 31, 2019
5,074

 
$
7.07



(1)
RSUs granted and forfeited during 2018 include 0.4 million RSUs held by the Company’s former CEO and COO that were modified to accelerate vesting. This modification was treated as forfeiture of the old awards and granting of new awards with modified vesting terms.
Schedule of Nonvested Performance-based Units Activity
Set forth below is a summary of unvested PSU activity for the year ended December 31, 2019:
 
Total Number of Units
(in thousands)
Weighted Average Grant Date Fair Value per Unit
 
Vesting Based on Performance Conditions
Weighted Average Grant Date Fair Value per Unit
 
Vesting Based on Market Conditions
Weighted Average Grant Date Fair Value per Unit
Unvested at December 31, 2018
—

$
—

 
—

$
—

 
—

$
—

Granted
1,239

$
3.99

 
985

$
4.06

 
254

$
3.73

Vested
—

$
3.99

 
—

$
—

 
—

$
—

Forfeited
(21
)
$
4.06

 
(21
)
$
4.06

 
—

$
3.73

Unvested at December 31, 2019
1,218

$
3.99

 
964

$
4.06

 
254

$
3.73
Schedule Of Share-based Payment Award, Performance Stock Units, Valuation Assumptions
Set forth below is a summary of the valuation inputs for PSUs granted with vesting subject to market conditions for the year ended December 31, 2019:
Valuation Inputs for PSUs with Vesting Subject to Market Conditions:
 
PSUs Issued (units in thousands)
254

Risk Free Rate
2.6
%
Volatility
55.1
%
Dividend
—

Valuation per Share
$
3.73

Total Fair Value (in thousands)
$
947

 
 
Expected Term
4 years

 
 
Forfeiture Rate Assumed
8.0
%