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Equity Compensation (Tables)
 9 Months Ended
Sep. 30, 2015
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,
 
2015
 
2014
 
2015
 
2014
Stock options:
 
 
 
 
 
 
 
Pre-tax compensation expense
$
17

 
$
30

 
$
51

 
$
90

Tax benefit
7

 
12

 
20

 
36

Stock option expense, net of tax
$
10

 
$
18

 
$
31

 
$
54

Restricted awards:
 
 
 
 
 
 
 
Pre-tax compensation expense
$
(92
)
 
$
1,022

 
$
1,949

 
$
3,097

Tax benefit
(36
)
 
393

 
770

 
1,228

Restricted award expense, net of tax
$
(56
)
 
$
629

 
$
1,179

 
$
1,869

Performance awards:
 
 
 
 
 
 
 
Pre-tax compensation expense
$
(60
)
 
$
468

 
$
1,648

 
$
1,185

Tax benefit
(24
)
 
179

 
651

 
468

Performance award expense, net of tax
$
(36
)
 
$
289

 
$
997

 
$
717
Schedule of Equity Compensation Stock Options Activity
The following table summarizes stock option activity for the nine months ended September 30, 2015:

 
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
248

 
$
18.18

 

 

Granted
—

 
—

 

 

Exercised
(48
)
 
17.46

 

 

Forfeited
(7
)
 
20.09

 

 

Expired
—

 
—

 

 

Outstanding at end of period
193

 
18.29

 
3.21
 
$
1,315

Exercisable at end of period
153

 
17.78

 
2.77
 
$
1,117
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, 2015:

 
Number of
Restricted
Awards (in
thousands)
 
Weighted
Average Grant
Date Fair
Value ($)
Nonvested at beginning of period
643

 
$
22.92

Granted
—

 
—

Vested
(10
)
 
23.02

Forfeited
(86
)
 
21.32

Nonvested at end of period
547

 
23.17
Schedule of Equity Compensation Restricted Stock Valuation Assumptions
The present value of estimated future dividends for the 2014 grants was calculated using the following weighted-average assumptions:
Dividends per share (quarterly amounts)
 
 
 
 
 
 
$
0.05

Risk-free interest rate
 
 
 
 
 
 
1.5
%
Schedule of Equity Compensation Performance Award Activity
The following table summarizes performance award activity for the nine months ended September 30, 2015:

 
Number of
Performance
Awards (in
thousands)
 
Weighted
Average Grant
Date Fair
Value ($)
Nonvested at beginning of period
183

 
$
25.06

Granted
202

 
28.79

Vested
(37
)
 
25.06

Forfeited
(83
)
 
27.18

Nonvested at end of period
265

 
27.23
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,
 
 
 
 
 
 
 
2015
 
2014
Dividends per share (quarterly amounts)
 
 
 
 
 
 
$
0.05

 
$
0.05

Risk-free interest rate
 
 
 
 
 
 
1.6
%
 
1.5
%