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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Share Based Compensation [Abstract]  
Schedule of Share-based Compensation, Restricted Stock Units Award Activity

A summary of the RSU activity, including performance awards and converted Isle awards, for the years ended December 31, 2015, 2016 and 2017 is as follows:

 

 

 

 

Equity Awards

 

 

 

Weighted-Average Grant

Date

Fair Value

 

 

 

Weighted-Average Remaining Contractual Life

 

 

 

Aggregate Fair Value

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(in years)

 

 

 

(in millions)

 

Unvested outstanding as of January 1, 2015

 

 

 

—

 

 

$

 

—

 

 

 

 

—

 

 

$

 

—

 

Granted (1)

 

 

 

917,283

 

 

 

 

4.08

 

 

 

 

 

 

 

 

 

 

 

Vested

 

 

 

(89,900

)

 

 

 

4.03

 

 

 

 

 

 

 

 

 

 

 

Unvested outstanding as of December 31, 2015

 

 

 

827,383

 

 

$

 

4.09

 

 

 

 

2.12

 

 

$

 

3.40

 

Granted (2)

 

 

 

410,694

 

 

 

 

10.81

 

 

 

 

 

 

 

 

 

 

 

Vested

 

 

 

(255,707

)

 

 

 

5.83

 

 

 

 

 

 

 

 

 

 

 

Unvested outstanding as of December 31, 2016

 

 

 

982,370

 

 

$

 

6.45

 

 

 

 

1.41

 

 

$

 

6.33

 

Granted (3)

 

 

 

600,206

 

 

 

 

20.91

 

 

 

 

 

 

 

 

 

 

 

Exchanged (4)

 

 

 

860,557

 

 

 

 

18.94

 

 

 

 

 

 

 

 

 

 

 

Forfeited

 

 

 

(11,870

)

 

 

 

15.74

 

 

 

 

 

 

 

 

 

 

 

Vested

 

 

 

(851,764

)

 

 

 

18.37

 

 

 

 

 

 

 

 

 

 

 

Unvested outstanding as of December 31, 2017

 

 

 

1,579,499

 

 

$

 

12.25

 

 

 

 

0.92

 

 

$

 

19.35

 

 

(1)

Includes 475,409 of performance awards at 135% of target and 351,974 time-based awards at 100% of target all of which were granted in 2015.

(2)

Includes 176,632 of performance awards at 96.5% of target and 234,062 time-based awards at 100% of target.

(3)

Includes 107,309 of performance awards at 108.5% of target, 100,833 of performance awards at 100% of target and 392,064 time-based awards at 100% of target. Performance awards granted in 2017 are based on a two-year performance criteria and accounted for as two sub-awards.

(4)

Represents exchanged Isle RSUs as a result of the Isle Acquisition based on the average of the ERI share price on the grant dates.
Schedule of Share-based Compensation, Stock Options Activity

A summary of the ERI Stock Option activity for the years ended December 31, 2015, 2016 and 2017:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Weighted-

 

 

Weighted-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Average

 

 

Average

 

 

 

 

 

 

 

 

 

 

Range of

 

 

Exercise

 

 

Remaining

 

 

Aggregate

 

 

 

Options

 

 

Exercise Prices

 

 

Price

 

 

Contractual Life

 

 

Intrinsic Value

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(in years)

 

 

(in millions)

 

Outstanding and Exercisable as of

   January 1, 2015

 

 

398,200

 

 

$

2.44

 

 

$

16.27

 

 

$

 

7.88

 

 

 

 

4.54

 

 

$

 

0.2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Expired

 

 

(86,000

)

 

 

 

 

 

$

11.30

 

 

$

 

11.30

 

 

 

 

 

 

 

 

 

 

 

Outstanding and Exercisable as of

   December 31, 2015

 

 

312,200

 

 

$

2.44

 

 

$

16.27

 

 

$

 

6.94

 

 

 

 

3.47

 

 

$

 

1.3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Expired

 

 

(10,000

)

 

 

 

 

 

$

11.30

 

 

$

 

11.30

 

 

 

 

 

 

 

 

 

 

 

Exercised

 

 

(132,900

)

 

$

2.44

 

 

$

3.94

 

 

$

 

2.89

 

 

 

 

 

 

 

 

 

 

 

Outstanding and Exercisable as of

   December 31, 2016

 

 

169,300

 

 

$

2.44

 

 

$

16.27

 

 

$

 

9.94

 

 

 

 

0.86

 

 

$

 

1.2

 

Exchanged (1)

 

 

1,351,168

 

 

$

6.87

 

 

$

15.60

 

 

 

 

10.12

 

 

 

 

 

 

 

 

 

 

 

Expired

 

 

(62,871

)

 

$

2.44

 

 

$

12.29

 

 

$

 

4.63

 

 

 

 

 

 

 

 

 

 

 

Exercised

 

 

(1,185,745

)

 

$

6.87

 

 

$

16.27

 

 

$

 

10.45

 

 

 

 

 

 

 

 

 

 

 

Outstanding and Exercisable as of

   December 31, 2017

 

 

271,852

 

 

$

3.94

 

 

$

15.60

 

 

$

 

9.63

 

 

 

 

1.04

 

 

$

 

6.4

 

 
Summary of Restricted Stock Awards Activity

A summary of the ERI Restricted Stock Awards activity for the year ended December 31, 2017 is as follows:

 

 

 

 

 

 

 

Weighted-

 

 

 

 

 

 

 

Average

 

 

 

 

 

 

 

Grant Date

 

 

 

Restricted Stock

 

 

Fair Value

 

 

 

 

 

 

 

 

 

 

Outstanding as of December 31, 2016

 

 

—

 

 

$

—

 

Exchanged (1)

 

 

180,374

 

 

 

19.23

 

Forfeited

 

 

(1,602

)

 

 

19.13

 

Vested

 

 

(167,963

)

 

 

19.24

 

Outstanding as of December 31, 2017

 

 

10,809

 

 

$

19.13

 

 

(1)

Represents exchanged Isle Restricted Stock Awards as a result of the Isle Acquisition.