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Share-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary Of Authrorized Shares
A summary of the authorized shares under these plans is detailed below:
Plan Description
Authorized Shares
1995 Directors Stock Option Plan
188

1996 Restricted Stock and Stock Option Plan
938

2000 Restricted Stock and Stock Option Plan
1,200

2004 Restricted Stock, Stock Option and Equity Compensation Plan
1,350

2008 A. M. Castle & Co. Omnibus Incentive Plan (amended and restated as of April 28, 2011)
2,750
Schedule of Nonvested Restricted Stock Units Activity
A summary of the non-vested share and RSU activity is as follows:
 
Shares
 
Units
 
Shares
 
Weighted-Average Grant
Date Fair Value
 
Units
 
Weighted-
Average Grant
Date Fair Value
Outstanding at January 1, 2012
38

 
$
18.74

 
232

 
$
14.39

Granted
73

 
$
12.22

 
309

 
$
10.60

Forfeited
(5
)
 
$
17.02

 
(158
)
 
$
12.44

Vested
(33
)
 
$
18.95

 
(85
)
 
$
12.45

Outstanding at December 31, 2012
73

 
$
12.22

 
298

 
$
12.05

Expected to vest at December 31, 2012
73

 
$
12.22

 
256

 
$
12.36
Schedule of Share Based Payment Award Performance Share Valuation Assumptions
The grant date fair values of performance shares awarded containing the RTSR market-based performance condition was estimated using a Monte Carlo simulation with the following assumptions:
 
2012
 
2011
 
2010
Grant Date Fair Value per Share
$
13.78

 
$
23.89

 
$
12.26

Expected volatility
85.0
%
 
62.0
%
 
61.6
%
Risk-free interest rate
0.40
%
 
1.10
%
 
1.45
%
Expected life (in years)
2.81

 
2.84

 
2.80

Expected dividend yield
—

 
—

 
—

Performance awards under the active LTC Plans were granted to the Company's new CEO in October 2012. The grant date fair values of performance shares awarded to the CEO containing the RTSR market-based performance condition was estimated using a Monte Carlo simulation with the following assumptions:
 
2012
 
2011
 
2010
Grant Date Fair Value per Share
$
16.65

 
$
10.61

 
$
5.57

Expected volatility
60.7
%
 
60.7
%
 
60.7
%
Risk-free interest rate
0.34
%
 
0.34
%
 
0.34
%
Expected life (in years)
2.21

 
1.21

 
0.21

Expected dividend yield
—

 
—

 
—
Summary of award information associated with market and non-market-based performance condition awards
The status of performance shares that have been awarded as part of the active LTC Plans is summarized below as of December 31, 2012:
Plan Year
Grant Date  Fair Value
 
Estimated Number of
Performance Shares  to be Issued
 
Maximum Number of
Performance Shares that
could Potentially be Issued
2012 LTC Plan
 
 
 
 
 
Market-based performance condition
$
13.78

 
172

 
244

Market-based performance condition (1)
$
16.65

 
41

 
58

Non-market-based performance condition
$
10.02

 
—

 
244

Non-market-based performance condition (1)
$
12.74

 
—

 
58

2011 LTC Plan
 
 
 
 
 
Market-based performance condition
$
23.89

 
39

 
131

Market-based performance condition (1)
$
10.61

 
9

 
32

Non-market-based performance condition
$
17.13

 
—

 
131

Non-market-based performance condition (1)
$
12.74

 
—

 
32

2010 LTC Plan
 
 
 
 
 
Market-based performance condition
$
12.26

 
83

 
237

Market-based performance condition (1)
$
5.57

 
2

 
5
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The exercise price of the options is $12.79 per share. The grant date fair value of $5.71 per share was estimated using the Black-Scholes option-pricing model with the following assumptions:
 
2010
Expected volatility
58.5
%
Risk-free interest rate
2.3
%
Expected life (in years)
5.5

Expected dividend yield
1.2
%
Schedule of Share-based Compensation, Stock Options, Activity
A summary of the stock option activity is as follows:
 
Shares
 
Weighted
Average
Exercise Price
 
Intrinsic
Value
 
Weighted Average
Remaining
Contractual Life
Stock options outstanding at January 1, 2012
418

 
$
12.44

 
 
 
 
Exercised
(16
)
 
$
9.11

 
 
 
 
Forfeited
(113
)
 
$
15.56

 
 
 
 
Expired
(19
)
 
$
12.60

 
 
 
 
Stock options outstanding at December 31, 2012
270

 
$
11.34

 
$
937

 
3.8
Stock options exercisable at December 31, 2012
111

 
$
9.25

 
$
621

 
1.5
Stock options vested or expected to vest as of December 31, 2012
259

 
$
11.28

 
$
915

 
3.7