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Shareholders Equity and Stock Options (Tables)
12 Months Ended
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Accumulated Balances Related to Each Component of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The components of accumulated other comprehensive income (loss) at December 31, 2012 and December 31, 2011 were as follows:

(Dollars in thousands)
December 31,
2012
 
December 31,
2011
Foreign currency translation adjustments
$
12,585

 
$
5,875

Funded status of pension plans and other postretirement benefits, net of tax of $22,371 and $20,799.
(70,158
)
 
(67,239
)
Unrealized gain (loss) on derivative instruments, net of tax of $127 and $0
(235
)
 
(270
)
Unrealized gain (loss) on marketable securities, net of tax of $0 and $1,555

 
(1,168
)
Accumulated other comprehensive income (loss)
$
(57,808
)
 
$
(62,802
)
Schedule of Share-based Compensation, Stock Options and Stock Appreciation Rights Award Activity [Table Text Block]
Shares of capital stock reserved for possible future issuance are as follows:

 
December 31, 2012
 
December 31, 2011
Stock acquisition program
120,883

 
120,883

Stock options and restricted stock
2,025,286

 
2,892,809

Rogers Employee Savings and Investment Plan
249,490

 
205,908

Rogers Corporation Global Stock Ownership Plan for Employees
201,676

 
227,050

Deferred compensation to be paid in stock
49,090

 
48,247

Total
2,646,425

 
3,494,897

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The fair value of options granted in 2012, 2011 and 2010 were calculated using the following weighted average assumptions:

 
December 31,
2012
 
December 31,
2011
 
December 31,
2010
Options granted
46,950

 
131,750

 
340,150

Weighted average exercise price
$
41.27

 
$
46.29

 
$
24.26

Weighted-average grant date fair value
19.08

 
21.08

 
11.40

 
 
 
 
 
 
Assumptions:
 

 
 

 
 

Expected volatility
47.70
%
 
46.92
%
 
45.41
%
Expected term (in years)
5.9

 
5.6

 
5.9

Risk-free interest rate
1.43
%
 
2.13
%
 
3.12
%
Expected dividend yield

 

 

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
A summary of the activity under our stock option plans as of December 31, 2012 and changes during the year then ended, is presented below:
 
Options Outstanding
 
Weighted- Average Exercise Price Per Share
 
Weighted-Average Remaining Contractual Life in Years
 
Aggregate Intrinsic Value
Options outstanding at December 31, 2011
2,401,809

 
$
37.54

 
5.0
 
12,195,931

Options granted
46,950

 
41.27

 
 
 
 

Options exercised
(614,263
)
 
42.97

 
 
 
 

Options cancelled
(68,549
)
 
43.57

 
 
 
 

Options outstanding at December 31, 2012
1,765,947

 
40.58

 
1.3
 
19,557,233

Options exercisable at December 31, 2012
1,274,340

 
43.61

 
3.2
 
11,230,647

Options vested or expected to vest at December 31, 2012*
1,751,199

 
40.64

 
4.2
 
19,307,435

 
2012
 
2011
 
2010
 
 
 
Options
Outstanding
 
Weighted-
Average
Exercise Price
Per Share
 
 
 
Options
Outstanding
 
Weighted-
Average
Exercise Price
Per Share
 
 
 
Options
Outstanding
 
Weighted-
Average
Exercise Price
Per Share
Outstanding at beginning of year
2,401,809

 
$
37.54

 
2,626,371

 
$
36.63

 
2,401,318

 
$
38.40

Options granted
46,950

 
41.27

 
131,750

 
46.29

 
340,150

 
24.26

Options exercised
(614,263
)
 
42.97

 
(329,964
)
 
33.61

 
(30,675
)
 
31.33

Options cancelled
(68,549
)
 
43.57

 
(26,348
)
 
30.77

 
(84,422
)
 
38.92

Outstanding at year-end
1,765,947

 
40.58

 
2,401,809

 
37.54

 
2,626.371

 
36.63

Options exercisable at year-end
1,274,340

 
 
 
1,609,982

 
 
 
1,674,979

 
 
Performance Shares [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
A summary of activity under the performance-based restricted stock plans for the fiscal years ended 2012, 2011 and 2010 is presented below:

 
2012
 
2011
 
2010
 
Awards Outstanding
 
Weighted-
Average
Grant Date Fair Value
 
Awards Outstanding
 
Weighted-
Average
Grant Date Fair Value
 
Awards Outstanding
 
Weighted-
Average
Grant Date Fair Value
Non-vested awards outstanding at beginning of year
101,730

 
$
31.19

 
115,250

 
$
27.09

 
98,400

 
$
32.29

Awards granted
22,120

 
41.27

 
20,630

 
47.89

 
37,350

 
27.43

Stock issued
(43,750
)
 
23.86

 

 

 

 

Awards forfeited or expired
(6,642
)
 
37.67

 
(34,150
)
 
27.43

 
(20,500
)
 
52.66

Non-vested awards outstanding at end of year
73,458

 
38.01

 
101,730

 
31.19

 
115,250

 
27.09


Time Based Restricted Stock [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
 
2012
 
2011
 
2010
 
Awards Outstanding
 
Weighted-
Average
Grant Date Fair Value
 
Awards Outstanding
 
Weighted-
Average
Grant Date Fair Value
 
Awards Outstanding
 
Weighted-
Average
Grant Date Fair Value
Non-vested awards outstanding at beginning of year
86,707

 
$
44.55

 
2,500

 
$
20.01

 
2,500

 
$
20.01

Awards granted
51,790

 
40.99

 
84,667

 
45.29

 

 

Stock issued
(16,620
)
 
41.64

 

 

 

 

Awards forfeited or expired
(6,738
)
 
46.21

 
(460
)
 
47.89

 

 

Non-vested awards outstanding at end of year
115,139

 
43.27

 
86,707

 
44.55

 
2,500

 
$
20.01

Deferred Stock Units [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
 
2012
 
2011
 
2010
 
Awards Outstanding
 
Weighted-
Average
Grant Date Fair Value
 
Awards Outstanding
 
Weighted-
Average
Grant Date Fair Value
 
Awards Outstanding
 
Weighted-
Average
Grant Date Fair Value
Non-vested awards outstanding at beginning of year
27,350

 
$
28.80

 
30,250

 
$
28.98

 
41,200

 
$
24.76

Awards granted
17,600

 
38.64

 
16,650

 
45.95

 
25,100

 
29.85

Stock issued
(14,800
)
 
45.95

 
(19,550
)
 
43.69

 
(36,050
)
 
24.76

Non-vested awards outstanding at end of year
30,150

 
26.13

 
27,350

 
28.80

 
30,250

 
28.98