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Employee Stock Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2012
Disclosure of Share-based Compensation and Retirement Costs [Abstract]  
Summary of Non-qualified Stock Option Disclosures
The following table summarizes non-qualified stock option disclosures for 2012, 2011 and 2010:
Year ended December 31,
(dollars in thousands, except options and assumptions)
 
2012
 
2011
 
2010
Stock options granted
 
163,042

 
168,939

 
220,007

Stock option compensation expense included in the Consolidated Statements of Operations
 
$
1,443

 
$
2,189

 
$
988

Weighted-average grant-date fair value of options granted using the Black-Scholes model
 
$
9.33

 
$
12.58

 
$
8.33

Weighted average assumptions for stock option grants:
 
 
 
 
 
 
Risk-free interest
 
1.08%
 
2.74%
 
2.86%
Expected term
 
6.3 years
 
6.3 years
 
6.3 years
Expected volatility
 
77.94%
 
88.15%
 
87.21%
Dividend yield
 
0.00%
 
0.00%
 
0.00%
Stock Options Activity
Information with respect to our stock option activity for 2012, 2011 and 2010 is as follows:
Options
 
Shares
 
Weighted-Average
Exercise Price
per Share
 
Weighted-Average
Remaining
Contractual Life
(In Years)
 
Aggregate
Intrinsic
Value
(in thousands)
Outstanding balance at January 1, 2010
 
1,644,167

 
$
17.18

 
6
 
$
2,258

Granted
 
220,007

 
$
11.10

 
 
 
 
Exercised
 
(9,279
)
 
$
14.50

 
 
 
$
84

Canceled
 
(139,961
)
 
$
28.05

 
 
 
 
Outstanding balance at December 31, 2010
 
1,714,934

 
$
15.58

 
6
 
$
6,710

Granted
 
168,939

 
$
16.72

 
 
 
 
Exercised
 
(69,327
)
 
$
6.95

 
 
 
$
681

Canceled
 
(188,840
)
 
$
27.90

 
 
 
 
Outstanding balance at December 31, 2011
 
1,625,706

 
$
14.63

 
4
 
$
3,957

Granted
 
163,042

 
$
13.96

 
 
 
 
Exercised
 
(223,382
)
 
$
5.52

 
 
 
$
2,694

Canceled
 
(253,732
)
 
$
22.75

 
 
 
 
Outstanding balance at December 31, 2012
 
1,311,634

 
$
14.47

 
4
 
$
7,651

Exercisable at December 31, 2012
 
964,043

 
$
15.06

 
 
 
$
5,391
Outstanding Options Exercisable and Weighted Average Exercise Price
The number of outstanding options exercisable and weighted average exercise price is as follows:
December 31,
 
2012
 
2011
 
2010
Outstanding options exercisable
 
964,043

 
1,202,949

 
1,164,814

Weighted average exercise price
 
$
15.06

 
$
16.14

 
$
19.48
Schedule of Nonvested Stock Option Activity
The following table summarizes our nonvested stock option activity for 2012, 2011 and 2010:
 
 
Shares
 
Weighted-Average
Value (per Share)
Nonvested at January 1, 2010
 
573,369

 
$
3.74

Granted
 
220,007

 
$
8.33

Vested
 
(221,065
)
 
$
5.57

Forfeited
 
(22,191
)
 
$
4.26

Nonvested at December 31, 2010
 
550,120

 
$
4.81

Granted
 
168,939

 
$
12.58

Vested
 
(283,185
)
 
$
6.87

Forfeited
 
(13,117
)
 
$
7.02

Nonvested at December 31, 2011
 
422,757

 
$
7.53

Granted
 
163,042

 
$
9.33

Vested
 
(202,115
)
 
$
5.76

Forfeited
 
(36,093
)
 
$
10.40

Nonvested at December 31, 2012
 
347,591

 
$
9.11
Performance Share Activity
A summary of the activity for performance shares under the Omnibus Plan for 2012, 2011 and 2010 is presented below:
Year ended December 31,
(dollars in thousands, except share amounts)
 
2012
 
2011
 
2010
Beginning share balance
 
—

 
123,826

 
171,861

Granted
 
—

 
—

 
—

Issued
 
—

 
(61,658
)
 
(48,035
)
Canceled
 
—

 
(62,168
)
 
—

Ending share balance
 
—

 
—

 
123,826

 
 
 
 
 
 
 
Performance share compensation (income) expense
 
$
—

 
$
(129
)
 
$
481
Restricted Stock Units Award Activity
A summary of the activity for restricted stock units under the Omnibus Plan for 2012, 2011 and 2010 is presented below:
Year ended December 31,
(dollars in thousands, except share amounts)
 
2012
 
2011
 
2010
Beginning nonvested balance
 
245,359

 
404,415

 
292,728

Granted
 
215,180

 
165,253

 
226,667

Vested
 
(152,340
)
 
(301,308
)
 
(111,480
)
Forfeited
 
(45,018
)
 
(23,001
)
 
(3,500
)
Ending nonvested balance
 
263,181

 
245,359

 
404,415

 
 
 
 
 
 
 
Weighted-average grant-date fair value per restricted stock unit
 
$
13.99

 
$
16.44

 
$
13.85

 
 
 
 
 
 
 
Compensation expense
 
$
1,878

 
$
2,956

 
$
2,027