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Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Disclosure of share-based compensation arrangements by share-based payment award [Table Text Block]
Stock-based compensation expense under all share-based payment plans—our Employee Stock Purchase Plan, stock option plans, stock-settled stock appreciation rights, and performance-based restricted stock units—included in the results of operations follows:
 
Year Ended December 31,
 
2018
 
2017
 
2016
Compensation expense, all share-based payment plans
$
3,370

 
$
4,049

 
$
2,811

Income tax benefit
602

 
1,315

 
823

Schedule of share-based compensation, stock-settled stock appreciation rights award activity [Table Text Block]
The following table summarizes the SSARs as of December 31, 2018
Stock-Settled
Stock Appreciation Rights
 
Number of
Rights
 
Weighted-
Average
Award Date
Value
 
Weighted-
Average
Remaining
Contractual
Life
 
Unrecognized
Compensation
Cost
 
Aggregate
Intrinsic
Value
Unvested, January 1, 2018
 
448,180

 
$
3.10

 
 
 
 
 
 
Granted
 
121,243

 
3.84

 
 
 
 
 
 
Forfeited
 

 

 
 
 
 
 
 
Vested
 
(188,441
)
 
2.93

 
 
 
 
 
 
Unvested, December 31, 2018
 
380,982

 
$
3.42

 
2.4 years
 
$
924

 
$
7,505

Schedule of share-based compensation, restricted stock units award activity [Table Text Block]
The following table summarizes restricted stock units as of December 31, 2018:
Restricted Stock Units
 
Number of
Stock Units
 
Weighted-
Average
Grant Date
Value
 
Weighted-
Average
Remaining
Contractual
Life
 
Unrecognized
Compensation
Cost
 
Aggregate
Intrinsic
Value
Unvested, January 1, 2018
 
290,666

 
$
14.41

 
 
 
 
 
 
Granted
 
44,926

 
18.55

 
 
 
 
 
 
Forfeited
 

 

 
 
 
 
 
 
Vested
 
(87,754
)
 
12.94

 
 
 
 
 
 
Unvested, December 31, 2018
 
247,838

 
$
15.68

 
1.9 years
 
$
1,727

 
$
4,882

Employee PRSUs
 
209,186

 
$
15.40

 
2.2 years
 
$
1,401

 
$
4,121

Nonemployee Director RSUs
 
38,652

 
$
17.17

 
1.3 years
 
$
326

 
$
761

Schedule of share-based payment award, stock options, valuation assumptions [Table Text Block]
The fair values of stock-based awards granted were estimated at the dates of grant with the following weighted-average assumptions:
 
Year Ended December 31,
 
2018
 
2017
 
2016
Volatility rate
10.1
%
 
10.3
%
 
10.6
%
Risk-free interest rate
2.7
%
 
2.2
%
 
1.8
%
Expected dividend yield
.7
%
 
.7
%
 
.7
%
Expected life of awards (years)
9.2

 
8.9

 
9.5

Schedule of share-based compensation, stock options, activity [Table Text Block]
The following table summarizes activity under the stock option plans for the year ended December 31, 2018:
Stock Options
 
Number of
Options
Outstanding
 
Weighted-
Average
Exercise
Price
 
Weighted-
Average
Remaining
Contractual
Life
 
Unrecognized
Compensation
Cost
 
Aggregate
Intrinsic
Value
Outstanding, January 1, 2018
 
1,528,615

 
$
13.05

 
 
 
 
 
 
Granted
 
143,250

 
19.10

 
 
 
 
 
 
Exercised
 
(147,321
)
 
9.93

 
 
 
 
 
 
Forfeited
 
(58,280
)
 
13.29

 
 
 
 
 
 
Outstanding, December 31, 2018
 
1,466,264

 
$
13.94

 
5.9 years
 
$
1,393

 
$
8,446

Exercisable, December 31, 2018
 
889,814

 
$
11.79

 
4.7 years
 
 

 
$
7,037

Schedule of share-based compensation, shares authorized under stock option plans, by exercise price range [Table Text Block]
Information regarding the stock options outstanding at December 31, 2018 is summarized below:
Stock Options
 Exercise Price
 
Number
Outstanding
 
Weighted-Average
Remaining
Contractual Life
 
Weighted-
Average
Exercise
Price
 
Number
Exercisable
 
Weighted-
Average
Exercise
Price
Employee options:
 
 
 
 
 
 
 
 
 
 
$
8.00

 
88,413

 
0.8 years
 
$
8.00

 
88,413

 
$
8.00

8.30

 
107,000

 
1.8 years
 
8.30

 
107,000

 
8.30

11.60

 
270,414

 
4.5 years
 
11.60

 
270,414

 
11.60

13.20

 
284,822

 
5.5 years
 
13.20

 
211,422

 
13.20

15.05

 
219,965

 
6.5 years
 
15.05

 
112,765

 
15.05

16.35

 
230,800

 
7.5 years
 
16.35

 
77,800

 
16.35

17.60

 
129,300

 
8.5 years
 
17.60

 
22,000

 
17.60

19.10

 
135,550

 
9.5 years
 
19.10

 

 
19.10

 

 
1,466,264

 
5.9 years
 
$
13.94

 
889,814

 
$
11.79