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Equity-based Compensation (Tables)
12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Restricted Stock and Restricted Stock Units Activity
A summary of stock award activity is as follows:
 
Years Ended December 31,
 
2018
 
2017
 
2016
 
Stock Awards

Weighted
Average
Award Date
Fair Value
 
Stock Awards
 
Weighted
Average
Award Date
Fair Value
 
Stock Awards
 
Weighted
Average
Award Date
Fair Value
Outstanding, beginning of year
1,428,878

 
$
21.53

 
1,501,021

 
$
20.58

 
1,275,707

 
$
20.54

Restricted stock units awarded
281,567

 
24.13

 
257,532

 
23.06

 
335,026

 
18.43

Performance stock units awarded
219,943

 
23.25

 
213,436

 
28.18

 
245,586

 
25.69

Restricted shares distributed

 


 
(179,169
)
 
22.44

 
(162,554
)
 
23.49

Restricted stock units distributed
(312,182
)
 
17.47

 
(95,510
)
 
20.71

 
(23,739
)
 
20.73

Performance stock units distributed
(296,909
)
 
21.55

 
(49,672
)
 
21.95

 

 

Restricted shares forfeited

 

 
(1,084
)
 
23.01

 
(22,045
)
 
23.34

Restricted stock units forfeited
(90,896
)
 
21.79

 
(81,626
)
 
20.36

 
(71,992
)
 
17.60

Performance stock units forfeited
(87,196
)
 
25.95

 
(136,050
)
 
24.29

 
(74,968
)
 
22.64

Outstanding, end of year
1,143,205

 
$
23.26

 
1,428,878

 
$
21.53

 
1,501,021

 
$
20.58

Schedule of Deferred Stock Unit Activity
deferred stock unit activity is as follows:
 
Years Ended December 31,
 
2018
 
2017
 
2016

Deferred
Stock
Units

Weighted
Average
Award
Date
Fair Value
 
Deferred
Stock
Units
 
Weighted
Average
Award
Date
Fair Value
 
Deferred
Stock
Units
 
Weighted
Average
Award
Date
Fair Value
Outstanding, beginning of year
269,977

 
$
20.14

 
253,445

 
$
19.93

 
247,219

 
$
19.92

Awarded
45,681

 
23.72

 
47,091

 
23.53

 
45,886

 
21.22

Shares distributed
(28,308
)
 
19.22

 
(30,559
)
 
23.57

 
(39,660
)
 
21.29

Outstanding, end of year
287,350


$
22.80

 
269,977

 
$
20.14

 
253,445

 
$
19.93

Schedule of Stock Options Activity
A summary of stock option activity is as follows:
 
Years Ended December 31,
 
2018
 
2017
 
2016

Shares

Weighted
Average
Exercise
Price
 
Shares
 
Weighted
Average
Exercise
Price
 
Shares
 
Weighted
Average
Exercise
Price
Outstanding, beginning of year
126,680

 
$
23.06

 
170,253

 
$
21.99

 
288,383

 
$
21.73

Exercised

 

 
(43,573
)
 
18.87

 
(114,307
)
 
21.33

Canceled/Expired
(73,897
)
 
26.60

 

 

 
(3,823
)
 
22.24

Outstanding, end of year
52,783


$
18.11

 
126,680

 
$
23.06

 
170,253

 
$
21.99

 
 
 
 
 
 
 
 
 
 
 
 
Exercisable, end of year
52,783

 
$
18.11

 
126,680

 
$
23.06

 
170,253

 
$
21.99

Schedule Stock Option Exercises
Financial data for stock option exercises are summarized in the following table (in thousands):

Years Ended December 31,

2018
 
2017
 
2016
Amount collected from stock option exercises
$

 
$
822

 
$
306

Total intrinsic value of stock option exercises

 
370

 
47

Tax benefit of stock option exercises recorded in income tax expense (1)
1,556

 
63

 

Tax benefit of stock option exercises recorded in additional paid-in-capital (1)

 

 
315

Aggregate intrinsic value of outstanding stock options

 
386

 
102

Aggregate intrinsic value of exercisable stock options

 
386

 
102

__________________________
(1) 
As of January 1, 2017, the Company adopted FASB Accounting Standards Update No. 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting, which, among other items, changed the accounting for the tax benefit of stock option exercises so that it is now recorded as part of current earnings rather than additional paid-in capital. Prior period balances were not retrospectively adjusted.
(2)
In 2018 and 2017 there were no expenses related to stock options as all issued stock options were fully vested at December 31, 2017 and expire in 2019.