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Stock Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of expenses related to share-based payments
The following table highlights stock based compensation for the years ended December 31, 2018, 2017 and 2016:
(in thousands)
 
2018
 
2017
 
2016
Restricted stock units (a)
 
$
11,133

 
$
6,006

 
$
4,643

Restricted stock
 
100

 
436

 
1,559

Stock options
 
82

 
327

 
1,050

Stock based compensation
 
$
11,315

 
$
6,769

 
$
7,252


(a) Includes service-based and performance-based restricted stock units.
Schedule of nonvested stock awards and restricted stock units awards
The following is a summary of restricted stock and restricted stock unit activity, excluding performance-based restricted stock units:
 
 
Restricted Stock
 
Restricted Stock Units
 
 
Number of Shares Outstanding
(in thousands)
 
Weighted Average Grant Date Fair Value
 
Number of
Units
Outstanding (in thousands)
 
Weighted
Average
Grant Date
Fair Value
December 31, 2015
 
455

 
$
13.51

 
282

 
$
16.99

Granted
 
—

 
—

 
166

 
17.65

Vested
 
(301
)
 
11.95

 
(123
)
 
16.86

Forfeited
 
(37
)
 
13.69

 
(27
)
 
17.16

December 31, 2016
 
117

 
17.42

 
298

 
17.39

Granted
 
—

 
—

 
396

 
21.79

Vested
 
(49
)
 
16.25

 
(163
)
 
17.49

Forfeited
 
(8
)
 
19.08

 
(21
)
 
20.34

December 31, 2017
 
60

 
18.17

 
510

 
20.65

Granted
 
—

 
—

 
748

 
20.22

Vested
 
(60
)
 
18.17

 
(266
)
 
20.64

Forfeited
 
—

 
—

 
(88
)
 
19.32

December 31, 2018
 
—

 
$
—

 
904

 
$
20.43
Schedule of performance-based restricted stock units
The following is a summary of the maximum number of performance-based restricted stock units which could be earned and related activity:
 
 
Performance-Based Restricted Stock Units
 
 
Number of
Units
Outstanding (in thousands)
 
Weighted
Average
Grant Date
Fair Value
December 31, 2015
 
—

 
$
—

Granted (a)
 
206

 
16.35

Vested
 
—

 
—

Forfeited
 
—

 
—

December 31, 2016
 
206

 
16.35

Granted (a)
 
255

 
21.94

Vested
 
—

 
—

Forfeited
 
(8
)
 
22.90

December 31, 2017
 
453

 
19.37

Granted (a)
 
474

 
19.64

Vested
 
—

 
—

Forfeited
 
(302
)
 
17.76

December 31, 2018
 
625

 
$
20.36

(a) Represents the maximum number of performance-based restricted stock units which could be earned.
Schedule of stock options
The following is a summary of stock option award activity:
 
 
Number of Options
(in thousands)
 
Weighted Average Exercise Price
 
Contractual
Term
(in years)
 
Intrinsic
Value
(in thousands)
Outstanding at December 31, 2015
 
1,228

 
$
14.17

 
 
 
 
Granted
 
3

 
17.04

 
 
 
 
Exercised
 
(175
)
 
7.90

 
 
 
 
Forfeited
 
(10
)
 
17.04

 
 
 
 
Expired
 
(22
)
 
17.53

 
 
 
 
Outstanding at December 31, 2016
 
1,024

 
15.15

 
 
 
 
Granted
 
—

 
—

 
 
 
 
Exercised
 
(260
)
 
13.05

 
 
 
 
Forfeited
 
(14
)
 
17.04

 
 
 
 
Expired
 
(45
)
 
19.89

 
 
 
 
Outstanding at December 31, 2017
 
705

 
15.59

 
 
 
 
Granted
 
—

 
—

 
 
 
 
Exercised
 
(96
)
 
14.01

 
 
 
 
Forfeited
 
(6
)
 
17.04

 
 
 
 
Expired
 
(7
)
 
16.37

 
 
 
 
Outstanding at December 31, 2018
 
596

 
$
15.82

 
5.3
 
$
982

 
 
 
 
 
 
 
 
 
Exercisable at December 31, 2018
 
596

 
$
15.82

 
5.3
 
$
982

 
 
 
 
 
 
 
 
 
Vested and expected to vest at December 31, 2018
 
596

 
$
15.82

 
5.3
 
$
982
Schedule of unrecognized compensation cost
The following table summarizes the Company’s total unrecognized compensation cost related to equity based compensation as of December 31, 2018:
(in thousands, except period data)
 
Unrecognized Compensation Cost
 
Weighted Average Remaining Period of Expense Recognition
(in years)
Restricted stock units
 
$
8,693

 
1.5
Performance-based restricted stock units
 
5,140

 
2.4
 
 
$
13,833