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Stock-Based Compensation Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Stock-Based Compensation [Abstract]  
Stock-based compensation expense [Table Text Block]
Stock-based compensation expense for the years ended December 31, 2018, 2017 and 2016 is as follows:
 
Year Ended December 31,
(In thousands)
2018
 
2017
 
2016
Stock options
$
1,388

 
$
2,023

 
$
2,954

Restricted share units
4,573

 
1,873

 
6,255

Total stock-based compensation expense
5,961

 
3,896

 
9,209

Tax benefit recognized in the statements of earnings
1,739

 
1,442

 
658

Stock-based compensation expense, net of tax
$
4,222

 
$
2,454

 
$
8,551
Stock option activity [Table Text Block]
Information with respect to stock option activity related to the Plans for the year ended December 31, 2018 follows:
 
Equity Awards
Outstanding
 
Weighted Average
Exercise Price
 
Weighted Average
Remaining Contractual Life
 
Aggregate Intrinsic
Value
(In thousands)
Balance outstanding at January 1, 2018
2,953,694

 
$
21.34

 
 
 
 
Granted
522,731

 
8.73

 
 
 
 
Exercised
(137,509
)
 
10.19

 
 
 
 
Forfeited
(373,690
)
 
12.79

 
 
 
 
Expired
(496,326
)
 
27.40

 
 
 
 
Balance outstanding at December 31, 2018
2,468,900

 
$
19.37

 
6.06
 
$
2,090

 
 
 
 
 
 
 
 
Exercisable at December 31, 2018
1,424,800

 
$
25.81

 
4.38
 
$
2,090
Weighted average fair values of options granted [Table Text Block]
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,
 
2018
 
2017
 
2016
Weighted average grant date fair value
$
3.80

 
$
2.92

 
$
3.06

Weighted average risk free interest rate
2.51
%
 
1.78
%
 
1.31
%
Weighted average expected dividend yield
—
%
 
3.03
%
 
3.16
%
Weighted average expected volatility
49.58
%
 
45.44
%
 
39.64
%
Weighted average expected life (in years)
4.63

 
4.50

 
4.63
Nonvested restricted stock units activity [Table Text Block]
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, 2018
1,344,411

 
$
10.87

Granted
1,188,565

 
8.73

Vested
(188,029
)
 
23.34

Forfeited
(489,085
)
 
8.66

Balance outstanding at December 31, 2018
1,855,862

 
$
8.82