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Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Activity of Restricted Stock
The following table details the activity in restricted stock during the years ended December 31, 2017, 2016 and 2015 (in thousands, except per share amounts):
 
 
 
Weighted- Average
Grant Date
Fair Value
 
 
 
 
Balance at January 1, 2015
3,383

 
$
27.00

Grants
602

 
$
18.63

Forfeited
(94
)
 
$
28.12

Fulfillment of service requirement
(1,887
)
 
$
26.87

Balance at December 31, 2015
2,004

 
$
24.56

Grants
356

 
$
18.23

Forfeited
(24
)
 
$
26.90

Fulfillment of service requirement
(974
)
 
$
25.65

Balance at December 31, 2016
1,362

 
$
22.09

Grants
391

 
$
23.65

Forfeited
—

 
$
—

Fulfillment of service requirement
(611
)
 
$
23.73

Balance at December 31, 2017
1,142

 
$
21.75
Activity of Restricted Stock Units
The following table details the activity in RSUs during the years ended December 31, 2017, 2016 and 2015 (in thousands, except per share amounts):
 
 
 
 
 
Weighted-Average
Grant Date
Fair Value
 
Future
Service
Required
 
No Future
Service
Required
 
Future
Service
Required
 
No Future
Service
Required
 
 
 
 
 
 
 
 
Balance at January 1, 2015
4,238

 
8,467

 
$
26.90

 
$
26.79

Grants
—

 
121

 
$
—

 
$
18.95

Distributions of underlying shares
—

 
(229
)
 
$
—

 
$
22.34

Forfeited
(626
)
 
—

 
$
26.90

 
$
—

Fulfillment of service requirement
(224
)
 
224

 
$
26.90

 
$
26.90

Balance at December 31, 2015
3,388

 
8,583

 
$
26.90

 
$
26.68

Grants
—

 
128

 
$
—

 
$
14.21

Distributions of underlying shares
—

 
(1,683
)
 
$
—

 
$
26.59

Forfeited
—

 
—

 
$
—

 
$
—

Fulfillment of service requirement
(3,320
)
 
3,320

 
$
26.90

 
$
26.90

Balance at December 31, 2016
68

 
10,348

 
$
26.90

 
$
26.61

Grants
—

 
104

 
$
—

 
$
21.55

Distributions of underlying shares
—

 
(175
)
 
$
—

 
$
26.46

Forfeited
—

 
—

 
$
—

 
$
—

Fulfillment of service requirement
(36
)
 
36

 
$
26.90

 
$
26.90

Balance at December 31, 2017
32

 
10,313

 
$
26.90

 
$
26.57
Activity of Stock Options
A summary of activity with respect to our stock options during the years ended December 31, 2017, 2016 and 2015 is as follows (in thousands, except per share amounts):
 
Common
Shares
Subject
to Option
 
Weighted-
Average
Exercise
Prices
 
Weighted-
Average
Remaining
Contractual
Term
 
Aggregate
Intrinsic
Value
 
 
 
 
 
 
 
 
Balance at January 1, 2015
1,640

 
$
24.91

 
 
 
 
Granted
—

 
$
—

 
 
 
 
Exercised
(2
)
 
$
21.66

 
 
 
$
6

Cancelled
(977
)
 
$
24.88

 
 
 
 

Balance at December 31, 2015
661

 
$
24.97

 
 
 
 

Granted
—

 
$
—

 
 
 
 

Exercised
—

 
$
—

 
 
 
$
—

Cancelled
(20
)
 
$
30.49

 
 
 
 

Balance at December 31, 2016
641

 
$
24.80

 
 
 
 

Granted
—

 
$
—

 
 
 
 

Exercised
(20
)
 
$
22.75

 
 
 
$
65

Cancelled
(290
)
 
$
26.98

 
 
 
 

Balance at December 31, 2017
331

 
$
23.03

 
1 year
 
$
1,156

Exercisable at December 31, 2017
264

 
$
23.07

 
1 year
 
$
911
Senior Executive Compensation Plan  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Activity of Restricted Stock Units
The following table details the activity in RSUs related to the senior executive compensation plan during the years ended December 31, 2017 and 2016 (in thousands, except per share amounts):
 
Target Number of Shares
 
Weighted- Average
Grant Date
Fair Value
 
 
 
 
Balance at December 31, 2015
—

 
$
—

Grants
3,434

 
$
9.68

Forfeited
—

 
$
—

Balance at December 31, 2016
3,434

 
$
9.68

Grants
2,221

 
$
19.06

Forfeited
—

 
$
—

Balance at December 31, 2017
5,655

 
$
13.37