v3.8.0.1
Share-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Summary of Status of Nonvested Shares

A summary of the status of nonvested shares for the years ended December 31, 2017, 2016 and 2015, is presented below:

 

 

 

Shares

 

 

Weighted

Average

Grant-Date

Fair Value

 

Nonvested at January 1, 2015

 

 

1,122,410

 

 

$

16.52

 

Granted

 

 

1,278,329

 

 

 

4.87

 

Vested

 

 

(419,222

)

 

 

15.26

 

Canceled

 

 

(246,261

)

 

 

14.30

 

Nonvested at December 31, 2015

 

 

1,735,256

 

 

$

8.60

 

Granted

 

 

1,318,229

 

 

 

1.90

 

Vested

 

 

(992,461

)

 

 

7.03

 

Canceled

 

 

(107,960

)

 

 

17.33

 

Nonvested at December 31, 2016

 

 

1,953,064

 

 

$

4.39

 

Granted

 

 

2,343,522

 

 

 

2.39

 

Vested

 

 

(902,197

)

 

 

6.73

 

Canceled

 

 

(89,728

)

 

 

5.17

 

Nonvested at December 31, 2017

 

 

3,304,661

 

 

$

2.21