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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2014
Stock-Based Compensation [Abstract]  
Stock-based Compensation Expense
Stock-based compensation expense for the years ended December 31, 2014, 2013 and 2012 is as follows (in thousands):
 
 
Year Ended December 31,
 
 
2014
 
2013
 
2012
Stock options
 
$
5,044

 
$
3,944

 
$
3,915

Restricted share units
 
1,515

 
2,512

 
4,451

Total stock-based compensation expense
 
6,559

 
6,456

 
8,366

Tax benefit recognized in the statements of earnings
 
2,117

 
2,464

 
3,022

Stock-based compensation expense, net of tax
 
$
4,442

 
$
3,992

 
$
5,344
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, 2014
 
2,331,157

 
$
31.36

 
 
 
 
Granted
 
1,024,057

 
28.41

 
 
 
 
Exercised
 
(211,617
)
 
21.86

 
 
 
 
Forfeited
 
(400,884
)
 
32.92

 
 
 
 
Expired
 
(116,749
)
 
33.28

 
 
 
 
Balance outstanding at December 31, 2014
 
2,625,964

 
$
30.63

 
7.25 years
 
$
16,045

 
 
 
 
 
 
 
 
 
Exercisable at December 31, 2014
 
1,017,677

 
$
29.12

 
5.21 years
 
$
7,750
Assumptions Used in Fair Value Calculation of Stock Options
During the year ended December 31, 2014 and 2013, the weighted average fair values of the options granted under the Plans were calculated using the Black-Scholes method. During the year ended December 31, 2012, the weighted average fair values of options granted were calculated using the binomial 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,
 
 
2014
 
2013
 
2012
Weighted average grant date fair value
 
$
6.49

 
$
9.27

 
$
10.08

Weighted average risk free interest rate
 
1.54
%
 
0.88
%
 
0.35
%
Weighted average expected dividend yield
 
3.28
%
 
2.34
%
 
1.74
%
Weighted average expected volatility
 
34.77
%
 
37.88
%
 
39.72
%
Weighted average expected life (in years)
 
5.00

 
4.43

 
6.25
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, 2014
 
516,672

 
$
32.69

Granted
 
375,834

 
23.16

Vested
 
(73,524
)
 
28.95

Forfeited
 
(183,409
)
 
29.02

Balance outstanding at December 31, 2014
 
635,573

 
$
28.53