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Stock Compensation and Share Repurchase Plan (Tables)
 12 Months Ended
Dec. 31, 2014
Equity [Abstract]  
Summary of Stock Option Activity
The following table summarizes information about stock option activity for the years ended December 31, 2014, 2013 and 2012: 

(shares in thousands)
2014
 
2013
 
2012
 
 
 
 
 
 
 
 
 
 
 
 
 
Options
 
Weighted-Avg
 
 Options
 
Weighted-Avg
 
 Options
 
Weighted-Avg
 
Outstanding
 
Exercise Price
 
 Outstanding
 
Exercise Price
 
 Outstanding
 
Exercise Price
Balance, beginning of period
981

 
$
16.17

 
1,850

 
$
15.37

 
2,151

 
$
14.48

Granted/assumed
440

 
$
12.12

 
—

 
$
—

 
20

 
$
11.98

Exercised
(572
)
 
$
11.93

 
(515
)
 
$
12.42

 
(174
)
 
$
5.63

Forfeited/expired
(42
)
 
$
19.28

 
(354
)
 
$
17.46

 
(147
)
 
$
13.45

Balance, end of period
807

 
$
16.80

 
981

 
$
16.17

 
1,850

 
$
15.37

Options exercisable, end of period
676

 
$
17.71

 
627

 
$
18.86

 
1,263

 
$
17.11

 
 
 
 
 
 
 
 
 
 
 
 
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, 2014:
(shares in thousands)
Options Outstanding
 
 Options Exercisable
 
 
 
 Weighted Avg.
 
 
 
 
 
 
 
 
 
 Remaining
 
 
 
 
 
 
Range of
 Options
 
 Contractual Life
 
 Weighted Avg.
 
 Options
 
 Weighted Avg.
Exercise Prices
 Outstanding
 
(Years)
 
 Exercise Price
 
 Exercisable
 
 Exercise Price
$4.58 to $11.89
258

 
5.08
 
$
10.96

 
223

 
$
10.81

$11.98 to $15.50
240

 
6.34
 
$
13.23

 
144

 
$
13.90

$21.22 to $24.71
234

 
0.09
 
$
23.67

 
234

 
$
23.67

$26.12 to $28.43
75

 
1.83
 
$
26.89

 
75

 
$
26.89

 
807

 
3.67
 
$
16.80

 
676

 
$
17.71
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 and at grant date for stock option grants for the year ended December 31, 2012:
 
2014
 
2013
 
2012
Dividend yield
3.25
%
 
n/a
 
3.90
%
Expected life (years)
6.8

 
n/a
 
7.4

Expected volatility
31
%
 
n/a
 
53
%
Risk-free rate
0.91
%
 
n/a
 
1.27
%
Weighted average fair value of options on date of grant
$
3.22

 
n/a
 
$
4.39
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)
2014
 
2013
 
2012
 
 
 
Weighted
 
 
 
Weighted
 
 
 
Weighted
 
Restricted
 
Average Grant
 
Restricted
 
Average Grant
 
Restricted
 
Average Grant
 
Shares Outstanding
 
Date Fair Value
 
Shares Outstanding
 
Date Fair Value
 
Shares Outstanding
 
Date Fair Value
Balance, beginning of period
992

 
$
12.79

 
763

 
$
12.39

 
585

 
$
12.98

Granted
839

 
$
17.33

 
467

 
$
13.04

 
369

 
$
11.80

Vested/released
(399
)
 
$
12.42

 
(153
)
 
$
12.17

 
(147
)
 
$
13.50

Forfeited/expired
(46
)
 
$
12.99

 
(85
)
 
$
11.74

 
(44
)
 
$
11.52

Balance, end of period
1,386

 
$
15.39

 
992

 
$
12.79

 
763

 
$
12.39
Schedule of Share-based Compensation Restricted Stock Activity
The following table summarizes information about nonvested restricted shares outstanding at December 31:
(shares in thousands)
2014
 
2013
 
2012
 
 
 
Weighted
 
 
 
Weighted
 
 
 
Weighted
 
Restricted
 
 Average
 
Restricted
 
 Average
 
Restricted
 
 Average
 
 Stock Units
 
 Grant Date
 
 Stock Units
 
 Grant Date
 
 Stock Units
 
 Grant Date
 
 Outstanding
 
 Fair Value
 
 Outstanding
 
 Fair Value
 
 Outstanding
 
 Fair Value
Balance, beginning of period
95

 
$
10.41

 
130

 
$
10.41

 
219

 
$
9.17

Assumed
994

 
$
18.58

 
—

 
$
—

 
25

 
$
10.39

Released
(342
)
 
$
16.91

 
—

 
$
—

 
—

 
$
—

Forfeited/expired
(72
)
 
$
18.58

 
(35
)
 
$
10.42

 
(114
)
 
$
8.01

Balance, end of period
675

 
$
18.03

 
95

 
$
10.41

 
130

 
$
10.41