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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock Based Compensation Expense
The following table discloses the amount of stock-based compensation expense:
 
 
Stock-Based Compensation
 
 
2016
 
2015
 
2014
Stock options
 
$
506

 
$
3,986

 
$
4,218

Restricted stock units
 
5,595

 
4,879

 
2,206

Performance stock units
 
7,469

 
6,054

 
2,623

Total stock-based compensation
 
$
13,570

 
$
14,919

 
$
9,047
Weighted-Average Assumptions
The fair value of these options was estimated at the date of grant using a Black-Scholes option pricing model with the following weighted-average assumptions:
 
 
 
 
2014
Risk-free interest rate
 
 
 
2.0
%
Dividend yield
 
 
 
1.8
%
Expected volatility of the Company’s common stock
 
 
 
0.640

Expected life in years
 
 
 
6.0
Details of Stock Options Activity
Summarized information for the plans follows:
 
 
Number of
Shares
 
Weighted
Average
Exercise
Price (per share)
 
Aggregate
Intrinsic
Value
(thousands)
Outstanding at December 31, 2015
 
668,132

 
$
21.71

 
 
Granted
 
—

 
—

 
 
Exercised
 
(166,434
)
 
23.12

 
 
Expired
 
(1,596
)
 
12.53

 
 
Canceled
 
(4,398
)
 
24.65

 
 
Outstanding at December 31, 2016
 
495,704

 
21.24

 
$
8,730

Exercisable at December 31, 2016
 
381,477

 
20.43

 
7,029


 
 
Year ended December 31,
 
 
2016
 
2015
 
2014
Weighted average grant-date fair value of options granted (per share)
 
$
—

 
$
—

 
$
12.26

Aggregate intrinsic value of options exercised (thousands)
 
$
2,640

 
$
20,100

 
$
2,711

Weighted average grant-date fair value of shares vested (thousands)
 
2,633

 
$
4,602

 
$
3,905
Segregated Disclosure of Options Outstanding
Segregated disclosure of options outstanding at December 31, 2016 was as follows:
 
 
Range of Exercise Prices
 
 
Less than or
equal to $15.63
 
Greater than
$15.63
Options outstanding
 
113,374

 
382,330

Weighted average exercise price
 
$
12.86

 
$
23.72

Remaining contractual life
 
5.4

 
7.1

Options exercisable
 
113,374

 
268,103

Weighted average exercise price
 
$
12.86

 
$
23.62
Details of Nonvested Restricted Stock Units Activity
The following table provides details of the nonvested restricted stock units for 2016:
 
 
Number of
Restricted Units
 
Weighted Average
Grant-Date Fair
Value (per share)
Nonvested at December 31, 2015
 
197,388

 
$
33.50

Granted
 
143,169

 
36.02

Vested
 
(99,697
)
 
32.05

Canceled
 
(3,409
)
 
34.46

Accrued dividend equivalents
 
3,123

 
35.09

Nonvested at December 31, 2016
 
240,574

 
$
35.75

 
 
Year ended December 31,
 
 
2016
 
2015
 
2014
Weighted average grant-date fair value of restricted shares granted (per share)
 
$
36.02

 
$
36.35

 
$
27.53

Weighted average grant-date fair value of shares vested (thousands)
 
$
3,195

 
$
2,629

 
$
1,185
Performance Based Units Earned under Long-Term Incentive Plan
The following table provides details of the nonvested performance stock units earned under the Company’s Long-Term Incentive Plan:
 
 
Number of
Performance Units
 
Weighted
Average Grant-
Date Fair Value
(per share)
Nonvested at December 31, 2015
 
191,536

 
$
34.18

Earned
 
179,865

 
36.76

Vested
 
(179,093
)
 
33.97

Canceled
 
(30,786
)
 
36.65

Accrued dividend equivalents
 
2,445

 
34.02

Nonvested at December 31, 2016
 
163,967

 
$
36.77