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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2015
Stock-Based Compensation [Abstract]  
Stock-based Compensation Expense
Stock-based compensation expense for the years ended December 31, 2015, 2014 and 2013 is as follows (in thousands):
 
 
Year Ended December 31,
 
 
2015
 
2014
 
2013
Stock options
 
$
4,030

 
$
5,044

 
$
3,944

Restricted share units
 
5,511

 
1,515

 
2,512

Total stock-based compensation expense
 
9,541

 
6,559

 
6,456

Tax benefit recognized in the statements of earnings
 
1,715

 
2,117

 
2,464

Stock-based compensation expense, net of tax
 
$
7,826

 
$
4,442

 
$
3,992
Stock Options Activity
Information with respect to stock option activity related to the Plans follows:
 
 
Equity Awards
Outstanding
 
Weighted Average
Exercise Price
 
Weighted Average
Remaining Contractual Life
 
Aggregate Intrinsic
Value
 
 
 
 
 
 
 
 
(In thousands)
Balance outstanding at January 1, 2015
 
2,625,964

 
$
30.63

 
 
 
 
Granted
 
717,265

 
29.23

 
 
 
 
Exercised
 
(65,366
)
 
22.72

 
 
 
 
Forfeited
 
(254,447
)
 
31.10

 
 
 
 
Expired
 
(149,050
)
 
32.35

 
 
 
 
Balance outstanding at December 31, 2015
 
2,874,366

 
$
30.33

 
6.82
 
$
17

 
 
 
 
 
 
 
 
 
Exercisable at December 31, 2015
 
1,325,966

 
$
30.18

 
5.06
 
$
17
Assumptions Used in Fair Value Calculation of Stock Options
he weighted average fair values of the options granted under the Plans were calculated using the Black-Scholes method. The weighted average grant date fair value and weighted average assumptions used in the option pricing models are as follows: 
 
 
Year Ended December 31,
 
 
2015
 
2014
 
2013
Weighted average grant date fair value
 
$
6.34

 
$
6.49

 
$
9.27

Weighted average risk free interest rate
 
1.42
%
 
1.54
%
 
0.88
%
Weighted average expected dividend yield
 
3.32
%
 
3.28
%
 
2.34
%
Weighted average expected volatility
 
33.28
%
 
34.77
%
 
37.88
%
Weighted average expected life (in years)
 
5.05

 
5.00

 
4.43
Nonvested Restricted Stock Units Activity
Information with respect to non-vested restricted stock unit activity follows:
 
 
Restricted Awards
Outstanding
 
Weighted Average
Grant Date Fair Value
Balance outstanding at January 1, 2015
 
635,573

 
$
28.53

Granted
 
582,020

 
27.85

Vested
 
(56,421
)
 
35.78

Forfeited
 
(293,417
)
 
31.29

Balance outstanding at December 31, 2015
 
867,755

 
$
26.67