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Stock Compensation and Share Repurchase Plan (Tables)
 12 Months Ended
Dec. 31, 2015
Equity [Abstract]  
Summary of Stock Option Activity
The following table summarizes information about stock option activity for the years ended December 31, 2015, 2014 and 2013: 

(shares in thousands)
2015
 
2014
 
2013
 
Options
Outstanding
 
Weighted-Avg
Exercise Price
 
Options
Outstanding
 
Weighted-Avg
Exercise Price
 
Options
Outstanding
 
Weighted-Avg
Exercise Price
Balance, beginning of period
807

 
$
16.80

 
981

 
$
16.17

 
1,850

 
$
15.37

Granted/assumed
—

 
$
—

 
440

 
$
12.12

 
—

 
$
—

Exercised
(83
)
 
$
11.06

 
(572
)
 
$
11.93

 
(515
)
 
$
12.42

Forfeited/expired
(252
)
 
$
22.88

 
(42
)
 
$
19.28

 
(354
)
 
$
17.46

Balance, end of period
472

 
$
14.58

 
807

 
$
16.80

 
981

 
$
16.17

Options exercisable, end of period
437

 
$
14.78

 
676

 
$
17.71

 
627

 
$
18.86
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]
The following table summarizes information about outstanding stock options issued under all plans as of December 31, 2015:
(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
$9.23 to $11.89
217

 
4.27
 
$
11.18

 
217

 
$
11.18

$11.98 to $15.50
180

 
4.78
 
$
13.54

 
145

 
$
13.90

$26.12 to $28.43
75

 
0.80
 
$
26.89

 
75

 
$
26.89

 
472

 
3.91
 
$
14.58

 
437

 
$
14.78
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The following weighted average assumptions were used to determine the fair value at the acquisition date of stock option grants assumed from the Sterling Merger during the year ended December 31, 2014:
 
2014
Dividend yield
3.25
%
Expected life (years)
6.8

Expected volatility
31
%
Risk-free rate
0.91
%
Weighted average fair value of options on date of grant
$
3.22
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)
2015
 
2014
 
2013
 
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
1,386

 
$
15.39

 
992

 
$
12.79

 
763

 
$
12.39

Granted
639

 
$
15.83

 
839

 
$
17.33

 
467

 
$
13.04

Vested/released
(516
)
 
$
14.58

 
(399
)
 
$
12.42

 
(153
)
 
$
12.17

Forfeited/expired
(133
)
 
$
15.22

 
(46
)
 
$
12.99

 
(85
)
 
$
11.74

Balance, end of period
1,376

 
$
16.18

 
1,386

 
$
15.39

 
992

 
$
12.79
Schedule of Share-based Compensation Restricted Stock Activity
The following table summarizes information about nonvested restricted shares outstanding at December 31:
(shares in thousands)
2015
 
2014
 
2013
 
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
675

 
$
18.03

 
95

 
$
10.41

 
130

 
$
10.41

Assumed
—

 
$
—

 
994

 
$
18.58

 
—

 
$
—

Released
(254
)
 
$
17.99

 
(342
)
 
$
16.91

 
—

 
$
—

Forfeited/expired
(158
)
 
$
18.48

 
(72
)
 
$
18.58

 
(35
)
 
$
10.42

Balance, end of period
263

 
$
18.58

 
675

 
$
18.03

 
95

 
$
10.41