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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares of Common Stock Available Under Share-Based Plans
Shares of Common Stock Available Under Share-Based Plans
 
 
As of December 31, 2015
 
 
Shares
Authorized
 
Shares Available
For Grant
Omnibus Plan
 
8,631,641

 
2,105,921

Directors Plan
 
481,250

 
102,063
Nonqualified Stock Option Transactions
Nonqualified Stock Option Transactions
(Amounts in thousands, except per share data)
 
 
Year Ended December 31, 2015
 
 
Number of Options
 
Weighted Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual
Term (1)
 
Aggregate
Intrinsic
Value (2)
Options outstanding beginning balance
 
1,153

 
$
32.93

 
 
 
 

Expired
 
(397
)
 
33.66

 
 
 
 

Options outstanding ending balance
 
756

 
$
32.55

 
1.32
 
$
273

Exercisable at the end of the year
 
756

 
$
32.55

 
1.32
 
$
273


(1) 
Represents the average remaining contractual life in years.
(2) 
Aggregate intrinsic value represents the total pre-tax intrinsic value that would have been received by the option holders if they had exercised their options on December 31, 2015. Intrinsic value equals the difference between the Company's average of the high and low stock price on the last trading day of the year and the option exercise price, multiplied by the number of shares. This amount will fluctuate with changes in the fair value of the Company's common stock.
Restricted Stock, Restricted Stock Unit, and Performance Share Award Transactions
Restricted Stock, Restricted Stock Unit, and Performance Share Award Transactions
(Amounts in thousands, except per share data)
 
 
Year Ended December 31, 2015
 
 
Restricted Stock/Unit Awards
 
Performance Shares
 
 
Number of
Shares/Units
 
Weighted
Average
Grant Date
Fair Value
 
Number of
Shares
 
Weighted
Average
Grant Date
Fair Value
Non-vested awards beginning balance
 
997

 
$
13.79

 
238

 
$
14.36

Granted
 
453

 
16.95

 
112

 
16.95

Vested
 
(483
)
 
12.54

 
—

 
—

Forfeited
 
(59
)
 
15.07

 
(12
)
 
15.07

Non-vested awards ending balance
 
908

 
$
15.92

 
338

 
$
15.19
Effect of Recording Share-Based Compensation Expense
Effect of Recording Share-Based Compensation Expense
(Dollar amounts in thousands)
 
 
Years ended December 31,
 
 
2015
 
2014
 
2013
Restricted stock, restricted unit, and performance share
  award expense
 
$
7,242

 
$
5,926

 
$
5,779

Salary stock award expense
 
—

 
—

 
124

Total share-based compensation expense
 
7,242

 
5,926

 
5,903

Income tax benefit
 
2,962

 
2,424

 
2,414

Share-based compensation expense, net of tax
 
$
4,280

 
$
3,502

 
$
3,489

Unrecognized compensation expense
 
$
8,644

 
$
6,937

 
$
6,327

Weighted-average amortization period remaining (in years)
 
1.4

 
1.3

 
1.2
Salary Stock Awards  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Other Share-based Compensation, Activity
Salary Stock Awards Granted
 
 
Years ended December 31,
 
 
2015
 
2014
 
2013
Shares granted
 
—

 
—

 
8,693

Weighted-average price
 
$
—

 
$
—

 
$
14.30
Restricted Stock  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Other Share-based Compensation, Activity
Other Restricted Stock, Restricted Stock Unit, and Performance Share Award Information
(Amounts in thousands, except per share data)
 
 
Years Ended December 31,
 
 
2015
 
2014
 
2013
Weighted-average grant date fair value of restricted stock, restricted stock unit, and
  performance share awards granted during the year
 
$
16.95

 
$
16.13

 
$
13.01

Total fair value of restricted stock and restricted stock unit awards vested during
  the year
 
7,615

 
7,546

 
4,917

Income tax benefit realized from the vesting/release of restricted stock and
  restricted stock unit awards
 
2,368

 
2,939

 
1,966