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Equity Compensation (Tables)
 9 Months Ended
Sep. 30, 2016
Equity Compensation [Abstract]  
Schedule of Equity Compensation Expense and Related Income Tax Benefit Recognized
The following table summarizes the equity compensation expense and related income tax benefit recognized in the Consolidated Statements of Income (in thousands): 
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2016
 
2015
 
2016
 
2015
Stock options:
 
 
 
 
 
 
 
Pre-tax compensation expense
$
5

 
$
17

 
$
14

 
$
51

Tax benefit
2

 
7

 
6

 
20

Stock option expense, net of tax
$
3

 
$
10

 
$
8

 
$
31

Restricted awards:
 
 
 
 
 
 
 
Pre-tax compensation expense
$
813

 
$
(92
)
 
$
1,743

 
$
1,949

Tax benefit
317

 
(36
)
 
680

 
770

Restricted award expense, net of tax
$
496

 
$
(56
)
 
$
1,063

 
$
1,179

Performance awards:
 
 
 
 
 
 
 
Pre-tax compensation expense
$
517

 
$
(60
)
 
$
628

 
$
1,648

Tax benefit
202

 
(24
)
 
245

 
651

Performance award expense, net of tax
$
315

 
$
(36
)
 
$
383

 
$
997
Schedule of Equity Compensation Stock Options Activity
The following table summarizes stock option activity for the nine months ended September 30, 2016:

 
Number of
Options
(in thousands)
 
Weighted
Average
Exercise
Price ($)
 
Weighted
Average
Remaining
Contractual
Term
(Years)
 
Aggregate
Intrinsic Value
(in thousands)
Outstanding at beginning of period
192

 
$
18.29

 

 

Granted
—

 
—

 

 

Exercised
(15
)
 
18.78

 

 

Forfeited
(2
)
 
22.28

 

 

Expired
—

 
—

 

 

Outstanding at end of period
175

 
18.21

 
2.15
 
$
884

Exercisable at end of period
166

 
18.00

 
1.99
 
$
876
Schedule of Equity Compensation, Restricted Stock and Restricted Stock Units Activity
The following table summarizes restricted award activity for the nine months ended September 30, 2016:

 
Number of
Restricted
Awards (in
thousands)
 
Weighted
Average Grant
Date Fair
Value ($)
Nonvested at beginning of period
445

 
$
24.32

Granted
—

 
—

Vested
(10
)
 
22.96

Forfeited
(46
)
 
21.51

Nonvested at end of period
389

 
24.69
Schedule of Equity Compensation Performance Award Activity
The following table summarizes performance award activity for the nine months ended September 30, 2016:

 
Number of
Performance
Awards (in
thousands)
 
Weighted
Average Grant
Date Fair
Value ($)
Nonvested at beginning of period
258

 
$
27.23

Granted
110

 
26.53

Vested
(60
)
 
27.11

Forfeited
(75
)
 
27.45

Nonvested at end of period
233

 
26.86
Schedule of Equity Compensation Performance Award Valuation Assumptions
The present value of estimated future dividends was calculated using the following assumptions:
 
 
 
 
 
 
 
Nine Months Ended
September 30,
 
 
 
 
 
 
 
2016
 
2015
Dividends per share (quarterly amounts)
 
 
 
 
 
 
$
0.06

 
$
0.05

Risk-free interest rate
 
 
 
 
 
 
1.5
%
 
1.6
%