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Common Stock and Incentive Awards (Tables)
 12 Months Ended
Dec. 31, 2016
Share Based Compensation [Abstract]  
Summary of RSU Activity

A summary of the RSU activity for the years ended December 31, 2014, 2015 and 2016 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 December 31, 2014

 

 

 

—

 

 

 

 

$

 

—

 

 

$

 

—

 

 

$

 

—

 

Granted

 

 

 

917,283

 

 

 

 

 

 

4.08

 

 

 

 

 

 

 

 

 

 

 

Vested

 

 

 

(89,900

)

 

 

 

 

 

4.03

 

 

 

 

 

 

 

 

 

 

 

Unvested outstanding as of December 31, 2015

 

 

 

827,383

 

 

(1

)

$

 

4.09

 

 

$

 

2.12

 

 

$

 

3.40

 

Granted

 

 

 

410,694

 

 

(2

)

 

 

10.81

 

 

 

 

 

 

 

 

 

 

 

Vested

 

 

 

(255,707

)

 

 

 

 

 

5.83

 

 

 

 

 

 

 

 

 

 

 

Unvested outstanding as of December 31, 2016

 

 

 

982,370

 

 

 

 

$

 

6.45

 

 

$

 

1.41

 

 

$

 

6.33

 

 

(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. There were no RSU grants in 2014.

(2)

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

 
Summary of ERI Stock Option Activity

A summary of the ERI Stock Option activity for the years ended December 31, 2014, 2015 and 2016:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Weighted-

 

 

Weighted-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Average

 

 

Average

 

 

 

 

 

 

 

 

 

 

Range of

 

 

Exercise

 

 

Remaining

 

 

Aggregate

 

 

 

Options

 

 

Exercise Prices

 

 

Price

 

 

Contractual Life

 

 

Intrinsic Value

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(in years)

 

 

(in millions)

 

Outstanding as of MTR Merger Date

 

 

474,833

 

 

$

2.44

 

-

$

16.27

 

 

$

 

7.13

 

 

 

 

 

 

 

 

 

 

 

Exercised

 

 

(76,633

)

 

$

2.44

 

-

$

3.94

 

 

$

 

3.22

 

 

 

 

 

 

 

 

 

 

 

Outstanding and Exercisable as of

   December 31, 2014

 

 

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