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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2016
Stock-Based Compensation [Abstract]  
Stock-based Compensation Expense
Stock-based compensation expense for the years ended December 31, 2016, 2015 and 2014 is as follows:
 
Year Ended December 31,
(In thousands)
2016
 
2015
 
2014
Stock options
$
2,954

 
$
4,030

 
$
5,044

Restricted share units
6,255

 
5,511

 
1,515

Total stock-based compensation expense
9,209

 
9,541

 
6,559

Tax benefit recognized in the statements of earnings
658

 
1,715

 
2,117

Stock-based compensation expense, net of tax
$
8,551

 
$
7,826

 
$
4,442
Stock Options Activity
Information with respect to stock option activity related to the Plans for the year ended December 31, 2016 follows:
 
Equity Awards
Outstanding
 
Weighted Average
Exercise Price
 
Weighted Average
Remaining Contractual Life
 
Aggregate Intrinsic
Value
(In thousands)
Balance outstanding at January 1, 2016
2,874,366

 
$
30.33

 
 
 
 
Granted
1,029,201

 
11.80

 
 
 
 
Forfeited
(454,028
)
 
24.01

 
 
 
 
Expired
(377,358
)
 
30.22

 
 
 
 
Balance outstanding at December 31, 2016
3,072,181

 
$
25.07

 
6.81
 
$
—

 
 
 
 
 
 
 
 
Exercisable at December 31, 2016
1,407,116

 
$
30.53

 
4.95
 
$
—
Assumptions Used in Fair Value Calculation of Stock Options
The 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,
 
2016
 
2015
 
2014
Weighted average grant date fair value
$
3.06

 
$
6.34

 
$
6.49

Weighted average risk free interest rate
1.31
%
 
1.42
%
 
1.54
%
Weighted average expected dividend yield
3.16
%
 
3.32
%
 
3.28
%
Weighted average expected volatility
39.64
%
 
33.28
%
 
34.77
%
Weighted average expected life (in years)
4.63

 
5.05

 
5.00
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, 2016
867,755

 
$
26.67

Granted
1,065,190

 
9.20

Vested
(249,638
)
 
23.34

Forfeited
(321,176
)
 
19.50

Balance outstanding at December 31, 2016
1,362,131

 
$
15.31