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Stock-Based Compensation Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Stock-Based Compensation [Abstract]  
Stock-based compensation expense [Table Text Block]
Stock-based compensation expense for the years ended December 31, 2017, 2016 and 2015 is as follows:
 
Year Ended December 31,
(In thousands)
2017
 
2016
 
2015
Stock options
$
2,023

 
$
2,954

 
$
4,030

Restricted share units
1,873

 
6,255

 
5,511

Total stock-based compensation expense
3,896

 
9,209

 
9,541

Tax benefit recognized in the statements of earnings
1,442

 
658

 
1,715

Stock-based compensation expense, net of tax
$
2,454

 
$
8,551

 
$
7,826
Stock option activity [Table Text Block]
Information with respect to stock option activity related to the Plans for the year ended December 31, 2017 follows:
 
Equity Awards
Outstanding
 
Weighted Average
Exercise Price
 
Weighted Average
Remaining Contractual Life
 
Aggregate Intrinsic
Value
(In thousands)
Balance outstanding at January 1, 2017
3,072,181

 
$
25.07

 
 
 
 
Granted
935,532

 
9.46

 
 
 
 
Exercised
(38,830
)
 
17.01

 
 
 
 
Forfeited
(695,697
)
 
17.93

 
 
 
 
Expired
(319,492
)
 
30.37

 
 
 
 
Balance outstanding at December 31, 2017
2,953,694

 
$
21.34

 
6.15
 
$
344

 
 
 
 
 
 
 
 
Exercisable at December 31, 2017
1,645,305

 
$
27.23

 
4.26
 
$
344
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,
 
2017
 
2016
 
2015
Weighted average grant date fair value
$
2.92

 
$
3.06

 
$
6.34

Weighted average risk free interest rate
1.78
%
 
1.31
%
 
1.42
%
Weighted average expected dividend yield
3.03
%
 
3.16
%
 
3.32
%
Weighted average expected volatility
45.44
%
 
39.64
%
 
33.28
%
Weighted average expected life (in years)
4.50

 
4.63

 
5.05
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, 2017
1,362,131

 
$
15.31

Granted
955,683

 
9.00

Vested
(176,707
)
 
19.39

Forfeited
(796,696
)
 
14.34

Balance outstanding at December 31, 2017
1,344,411

 
$
10.87