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Stock-Based Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Assumptions to estimate fair value of stock options and SAR's
The following table sets forth the weighted average fair value of stock options and the assumptions used to estimate the fair value of the stock options using the Black-Scholes option valuation model:
 
2013
 
2012
 
2011
Weighted average fair value of stock options granted
$
12.60

 
$
15.77

 
$
17.85

Volatility
76.74
%
 
70.56
%
 
72.56
%
Expected life in years
5.0

 
5.5

 
6.0

Risk-free interest rate
0.84
%
 
0.89
%
 
2.30
%
Dividend yield
—

 
—

 
—
Summary of stock option and SAR's activity
The following table summarizes stock option and SARs activity for the years ended December 31, 2013, 2012 and 2011:
 
Stock Options
 
SARs
 
Shares
 
Weighted
Average
Exercise
Price
 
Shares
 
Weighted
Average
Exercise
Price
Outstanding at December 31, 2010
330,840

 
$
24.60

 
230,563

 
$
13.46

Granted
139,916

 
27.39

 
—

 
—

Exercised
(129,785
)
 
11.41

 
(119,801
)
 
13.10

Canceled/forfeited
(19,364
)
 
40.16

 
(3,123
)
 
14.46

Outstanding at December 31, 2011
321,607

 
24.60

 
107,639

 
13.46

Granted
151,102

 
26.97

 
—

 
—

Exercised
(40,173
)
 
11.84

 
(34,385
)
 
12.73

Canceled/forfeited
(62,536
)
 
29.22

 
(4,389
)
 
15.40

Outstanding at December 31, 2012
370,000

 
30.20

 
68,865

 
13.83

Granted
190,452

 
20.41

 
—

 
—

Exercised
(13,027
)
 
10.77

 
(6,617
)
 
13.14

Canceled/forfeited
(131,855
)
 
29.30

 
(12,039
)
 
15.40

Outstanding at December 31, 2013
415,570

 
$
27.36

 
50,209

 
$
14.15
Exercise Price Range
 
 
Options Outstanding
 
Options Exercisable
Range of
Exercise Price
 
Number
Outstanding
 
Weighted Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual
Life (Years)
 
Number
Exercisable
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual Life (Years)
$ 0.00-$10.00
 
13,262

 
$
10.00

 
5.09
 
13,262

 
$
10.00

 
5.09
$10.00-$20.00
 
99,245

 
$
17.25

 
9.21
 
3,936

 
$
19.01

 
8.35
$20.00-$30.00
 
227,896

 
$
26.07

 
6.61
 
99,310

 
$
27.29

 
4.05
$30.00-$40.00
 
38,369

 
$
39.00

 
1.25
 
37,515

 
$
39.09

 
1.12
$40.00-$50.00
 
14,386

 
$
48.50

 
1.34
 
14,386

 
$
48.50

 
1.34
$50.00-$60.00
 
9,544

 
$
51.40

 
0.91
 
9,544

 
$
51.40

 
0.91
$60.00-$70.00
 
3,219

 
$
66.60

 
0.02
 
3,219

 
$
66.60

 
0.02
$70.00-$80.00
 
9,649

 
$
70.90

 
0.14
 
9,649

 
$
70.90

 
0.14
 
 
415,570

 
$
27.36

 
 
 
190,821

 
$
33.91

 
 
Summary of restricted stock and restricted stock units activity
he following table summarizes restricted stock and restricted stock units activity for the years ended December 31, 2013, 2012 and 2011:
 
Restricted Stock
 
Restricted Stock Units
 
Number of
Shares
 
Weighted
Average
Grant Date
Fair Value
 
Number of
Units
 
Weighted Average
Fair Value
Outstanding at December 31, 2010
64,623

 
$
11.37

 
126,416

 
$
27.32

Granted
205,463

 
27.37

 
—

 
—

Vested
(85,323
)
 
19.36

 
(79,014
)
 
27.87

Cancelled/Forfeited
(11,254
)
 
26.89

 
(1,884
)
 
25.03

Outstanding at December 31, 2011
173,509

 
11.37

 
45,518

 
27.32

Granted
230,096

 
26.40

 
—

 
—

Vested
(95,336
)
 
23.15

 
(31,456
)
 
25.92

Cancelled/Forfeited
(68,571
)
 
27.43

 
(2,651
)
 
24.60

Outstanding at December 31, 2012
239,698

 
25.38

 
11,411

 
24.14

Granted
573,467

 
15.38

 
—

 
—

Vested
(90,963
)
 
26.83

 
(11,411
)
 
22.74

Cancelled/Forfeited
(109,116
)
 
23.30

 
—

 
—

Outstanding at December 31, 2013
613,086

 
$
16.68

 
—

 
$
—
Summary of performance shares and performance unit activity
The following table summarizes performance shares and performance units’ activity for the years-ended December 31, 2013, 2012, and 2011:
 
Performance Shares
 
Performance Units
 
Number of
Shares
 
Weighted
Average
Grant Date
Fair Value
 
Number of
Units
 
Weighted Average
Fair Value
Outstanding at December 31, 2010
100,828

 
$
16.29

 
145,023

 
$
35.41

Granted
81,489

 
42.72

 
—

 
—

Vested
(56,830
)
 
23.24

 
(57,948
)
 
24.68

Cancelled/Forfeited
(19,558
)
 
48.62

 
(2,536
)
 
25.03

Outstanding at December 31, 2011
105,929

 
16.29

 
84,539

 
35.41

Granted
145,508

 
25.78

 
32,498

 
—

Vested
(111,703
)
 
7.96

 
(74,845
)
 
31.17

Cancelled/Forfeited
(30,575
)
 
42.11

 
(7,953
)
 
49.20

Outstanding at December 31, 2012
109,159

 
26.92

 
34,239

 
39.78

Granted
173,773

 
23.35

 
34,239

 
38.02

Vested
(4,160
)
 
30.97

 
(68,478
)
 
38.02

Cancelled/Forfeited
(68,377
)
 
34.49

 
—

 
—

Outstanding at December 31, 2013
210,395

 
$
28.04

 
—

 
$
—