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Stock Compensation and Share Repurchase Plan (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Summary of Stock Option Activity
The following table summarizes information about stock option activity for the years ended December 31, 2017, 2016 and 2015: 

(shares in thousands)
2017
 
2016
 
2015
 
Options
Outstanding
 
Weighted-Avg.
Exercise Price
 
Options
Outstanding
 
Weighted-Avg.
Exercise Price
 
Options
Outstanding
 
Weighted-Avg.
Exercise Price
Balance, beginning of period
219

 
$
15.74

 
472

 
$
14.58

 
807

 
$
16.80

Exercised
(71
)
 
$
13.59

 
(219
)
 
$
11.95

 
(83
)
 
$
11.06

Forfeited/expired
(50
)
 
$
26.12

 
(34
)
 
$
24.19

 
(252
)
 
$
22.88

Balance, end of period
98

 
$
11.99

 
219

 
$
15.74

 
472

 
$
14.58

Options exercisable, end of period
98

 
$
11.99

 
211

 
$
15.88

 
437

 
$
14.78
Schedule of Outstanding Stock Options Issued by Exercise Price Range
The following table summarizes information about outstanding stock options issued under all plans as of December 31, 2017:
(shares in thousands)
Options Outstanding
 
 Options Exercisable
Range of Exercise Prices
Options
Outstanding
 
Weighted Avg. Remaining Contractual Life
(Years)
 
Weighted Avg.
Exercise Price
 
Options
Exercisable
 
Weighted Avg.
Exercise Price
$10.49 to $11.59
21

 
1.69
 
$
11.22

 
21

 
$
11.22

$11.89
40

 
2.09
 
$
11.89

 
40

 
$
11.89

$11.98 to $12.87
37

 
3.49
 
$
12.51

 
37

 
$
12.51

 
98

 
2.54
 
$
11.99

 
98

 
$
11.99
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

Summary of Nonvested Restricted Share Activity
The following table summarizes information about nonvested restricted share activity for the year ended December 31: 

(shares in thousands)
2017
 
2016
 
2015
 
Restricted
Shares Outstanding
 
Weighted Average
Grant Date
Fair Value
 
Restricted Shares Outstanding
 
Weighted Average
Grant Date
Fair Value
 
Restricted
Shares Outstanding
 
Weighted Average
Grant Date
Fair Value
Balance, beginning of period
1,096

 
$
15.61

 
1,376

 
$
16.18

 
1,386

 
$
15.39

Granted
624

 
$
18.19

 
601

 
$
14.46

 
639

 
$
15.83

Vested/released
(318
)
 
$
16.37

 
(766
)
 
$
15.87

 
(516
)
 
$
14.58

Forfeited/expired
(154
)
 
$
16.39

 
(115
)
 
$
14.70

 
(133
)
 
$
15.22

Balance, end of period
1,248

 
$
16.61

 
1,096

 
$
15.61

 
1,376

 
$
16.18
Schedule of Share-based Compensation Restricted Stock Activity
The following table summarizes information about nonvested restricted stock units outstanding at December 31:

(shares in thousands)
2017
 
2016
 
2015
 
Restricted Stock Units Outstanding
 
Weighted Average Grant Date
Fair Value
 
Restricted Stock Units
Outstanding
 
Weighted Average
Grant Date
Fair Value
 
Restricted Stock Units
Outstanding
 
Weighted Average
Grant Date
Fair Value
Balance, beginning of period
78

 
$
18.58

 
263

 
$
18.58

 
675

 
$
18.03

Released
(51
)
 
$
18.58

 
(137
)
 
$
18.58

 
(254
)
 
$
17.99

Forfeited/expired
(5
)
 
$
18.58

 
(48
)
 
$
18.58

 
(158
)
 
$
18.48

Balance, end of period
22

 
$
18.58

 
78

 
$
18.58

 
263

 
$
18.58