Share-Based Awards and Cash-Based Awards (Tables)
|
12 Months Ended |
Dec. 31, 2017 |
|---|
| Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
|
| Summary of Share Activity Related to Restricted Stock Units |
A summary of activity related to RSUs is as follows:
|
|
2017
|
|
|
2016
|
|
|
2015
|
|
|
|
Restricted Stock Units
|
|
|
Weighted Average Grant Date Fair Value Per Share
|
|
|
Restricted Stock Units
|
|
|
Weighted Average Grant Date Fair Value Per Share
|
|
|
Restricted Stock Units
|
|
|
Weighted Average Grant Date Fair Value Per Share
|
|
|
Nonvested, beginning of period
|
|
6,107,248
|
|
|
$
|
2.73
|
|
|
|
3,474,079
|
|
|
$
|
7.42
|
|
|
|
1,977,335
|
|
|
$
|
15.29
|
|
|
Granted
|
|
2,128,879
|
|
|
|
2.76
|
|
|
|
4,213,964
|
|
|
|
2.21
|
|
|
|
2,626,930
|
|
|
|
3.59
|
|
|
Vested
|
|
(2,108,553
|
)
|
|
|
3.45
|
|
|
|
(968,652
|
)
|
|
|
16.69
|
|
|
|
(721,038
|
)
|
|
|
13.23
|
|
|
Forfeited
|
|
(362,323
|
)
|
|
|
2.87
|
|
|
|
(612,143
|
)
|
|
|
3.64
|
|
|
|
(409,148
|
)
|
|
|
10.63
|
|
|
Nonvested, end of period
|
|
5,765,251
|
|
|
$
|
2.48
|
|
|
|
6,107,248
|
|
|
$
|
2.73
|
|
|
|
3,474,079
|
|
|
$
|
7.42
|
|
|
| Schedule of Restricted Stock Units Outstanding |
Subject to the satisfaction of service conditions, the RSUs outstanding as of December 31, 2017 are eligible to vest in the year indicated in the table below:
|
|
Restricted Stock Units
|
|
|
2018
|
|
3,742,509
|
|
|
2019
|
|
2,022,742
|
|
|
Total
|
|
5,765,251
|
|
|
| Schedule of Restricted Stock Activity |
A summary of activity related to Restricted Shares is as follows:
|
|
2017
|
|
|
2016
|
|
|
2015
|
|
|
|
Restricted Shares
|
|
|
Weighted Average Grant Date Fair Value Per Share
|
|
|
Restricted Shares
|
|
|
Weighted Average Grant Date Fair Value Per Share
|
|
|
Restricted Shares
|
|
|
Weighted Average Grant Date Fair Value Per Share
|
|
|
Nonvested, beginning of period
|
|
161,296
|
|
|
$
|
3.47
|
|
|
|
78,230
|
|
|
$
|
8.95
|
|
|
|
43,210
|
|
|
$
|
16.20
|
|
|
Granted
|
|
147,372
|
|
|
|
1.90
|
|
|
|
126,128
|
|
|
|
2.22
|
|
|
|
56,540
|
|
|
|
6.19
|
|
|
Vested
|
|
(62,140
|
)
|
|
|
4.51
|
|
|
|
(43,062
|
)
|
|
|
9.75
|
|
|
|
(21,520
|
)
|
|
|
16.26
|
|
|
Nonvested, end of period
|
|
246,528
|
|
|
$
|
2.27
|
|
|
|
161,296
|
|
|
$
|
3.47
|
|
|
|
78,230
|
|
|
$
|
8.95
|
|
|
| Schedule of Restricted Stock Awards Outstanding |
Subject to the satisfaction of service conditions, the Restricted Shares outstanding as of December 31, 2017 are expected to vest as follows:
|
|
Restricted Shares
|
|
|
2018
|
|
106,240
|
|
|
2019
|
|
91,164
|
|
|
2020
|
|
49,124
|
|
|
Total
|
|
246,528
|
|
|
| Summary of Compensation Expense under Share-Based Payment Arrangements and Related Tax Benefit |
A summary of compensation expense under share-based payment arrangements and the related tax benefit is as follows (in thousands):
|
|
Year Ended December 31,
|
|
|
|
2017
|
|
|
2016
|
|
|
2015
|
|
|
Share-based compensation expense from:
|
|
|
|
|
|
|
|
|
|
|
|
|
Restricted stock units
|
$
|
7,785
|
|
|
$
|
10,640
|
|
|
$
|
9,978
|
|
|
Restricted stock
|
|
280
|
|
|
|
373
|
|
|
|
358
|
|
|
Common shares
|
|
—
|
|
|
|
—
|
|
|
|
(94
|
)
|
|
Total
|
$
|
8,065
|
|
|
$
|
11,013
|
|
|
$
|
10,242
|
|
|
Share-based compensation tax benefit:
|
|
|
|
|
|
|
|
|
|
|
|
|
Tax benefit computed at the statutory rate
|
$
|
1,694
|
|
|
$
|
3,855
|
|
|
$
|
3,585
|
|
|
| Summary of Compensation Expense Related to Share-Based Awards and Cash-Based Awards |
A summary of compensation expense related to share-based awards and cash-based awards is as follows (in thousands):
|
|
Year Ended December 31,
|
|
|
|
2017
|
|
|
2016
|
|
|
2015
|
|
|
Share-based compensation included in:
|
|
|
|
|
|
|
|
|
|
|
|
|
General and administrative
|
$
|
8,065
|
|
|
$
|
11,013
|
|
|
$
|
10,242
|
|
|
Cash-based incentive compensation included in:
|
|
|
|
|
|
|
|
|
|
|
|
|
Lease operating expense
|
|
2,101
|
|
|
|
—
|
|
|
|
364
|
|
|
General and administrative (1)
|
|
5,032
|
|
|
|
—
|
|
|
|
(233
|
)
|
|
Total charged to operating income
|
$
|
15,198
|
|
|
$
|
11,013
|
|
|
$
|
10,373
|
|
|
|
(1)
|
Adjustments to true up estimates to actual payments resulted in net credit balances to expense in 2015.
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|