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Equity-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
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,
 
2017
 
2016
 
2015
 
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
1,501,021

 
$
20.58

 
1,275,707

 
$
20.54

 
767,540

 
$
21.93

Restricted stock units awarded
257,532

 
23.06

 
335,026

 
18.43

 
422,141

 
17.37

Performance stock units awarded
213,436

 
28.18

 
245,586

 
25.69

 
297,164

 
21.55

Restricted shares distributed
(179,169
)
 
22.44

 
(162,554
)
 
23.49

 
(90,607
)
 
19.25

Restricted stock units distributed
(95,510
)
 
20.71

 
(23,739
)
 
20.73

 
(12,646
)
 
19.62

Performance stock units distributed
(49,672
)
 
21.95

 
—

 
—

 
—

 
—

Restricted shares forfeited
(1,084
)
 
23.01

 
(22,045
)
 
23.34

 
(54,045
)
 
23.40

Restricted stock units forfeited
(81,626
)
 
20.36

 
(71,992
)
 
17.60

 
(27,360
)
 
18.79

Performance stock units forfeited
(136,050
)
 
24.29

 
(74,968
)
 
22.64

 
(26,480
)
 
22.42

Outstanding, end of year
1,428,878

 
$
21.53

 
1,501,021

 
$
20.58

 
1,275,707

 
$
20.54
Schedule of Deferred Stock Unit Activity
The following table summarizes information about deferred stock unit activity:
 
Years Ended December 31,
 
2017
 
2016
 
2015

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
253,445

 
$
19.93

 
247,219

 
$
19.92

 
221,471

 
$
20.10

Awarded
47,091

 
23.53

 
45,886

 
21.22

 
53,527

 
18.56

Shares distributed
(30,559
)
 
23.57

 
(39,660
)
 
21.29

 
(27,779
)
 
18.76

Outstanding, end of year
269,977


$
20.14

 
253,445

 
$
19.93

 
247,219

 
$
19.92
Schedule of Stock Options Activity
A summary of stock option activity is as follows:
 
Years Ended December 31,
 
2017
 
2016
 
2015

Shares

Weighted
Average
Exercise
Price
 
Shares
 
Weighted
Average
Exercise
Price
 
Shares
 
Weighted
Average
Exercise
Price
Outstanding at January 1
170,253

 
$
21.99

 
288,383

 
$
21.73

 
503,134

 
$
18.18

Exercised
(43,573
)
 
18.87

 
(114,307
)
 
21.33

 
(209,205
)
 
13.13

Canceled/Expired
—

 
—

 
(3,823
)
 
22.24

 
(5,546
)
 
24.21

Outstanding at December 31
126,680


$
23.06

 
170,253

 
$
21.99

 
288,383

 
$
21.73

 
 
 
 
 
 
 
 
 
 
 
 
Exercisable at December 31
126,680

 
$
23.06

 
170,253

 
$
21.99

 
284,929

 
$
21.78
Schedule Stock Option Exercises
Financial data for stock option exercises are summarized in the following table (in thousands):

Years Ended December 31,

2017
 
2016
 
2015
Amount collected from stock option exercises
$
822

 
$
306

 
$
2,748

Total intrinsic value of stock option exercises
370

 
47

 
1,108

Tax benefit of stock option exercises recorded in income tax expense (1)
63

 
—

 
—

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

 
315

 
209

Aggregate intrinsic value of outstanding stock options
386

 
102

 
173

Aggregate intrinsic value of exercisable stock options
386

 
102

 
169

__________________________
(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.