Capital Stock and Equity Compensation (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Shares of capital stock reserved for possible future issuance

Shares of capital stock reserved for possible future issuance were as follows:

	As of December 31,
	2020	2019
Shares reserved for issuance under outstanding restricted stock unit awards	324,260	315,571
Deferred compensation to be paid in stock, including deferred stock units	12,715	7,681
Additional shares reserved for issuance under Rogers Corporation 2019 Long-Term Equity Compensation Plan	918,809	1,063,920
Shares reserved for issuance under the Rogers Corporation Global Stock Ownership Plan for Employees	78,678	91,670
Total	1,334,462	1,478,842

Schedule of weighted-average assumptions used

	Pension Benefits				Other Postretirement Benefits
	2020		2019		2020		2019
Weighted average assumptions used in benefit obligations:
Discount rate	2.50	%	3.25	%	1.75	%	2.75	%
Weighted average assumptions used in net periodic benefit costs:
Discount rate	3.25	%	4.25	%	2.75	%	3.75	%
Expected long-term rate of return on assets	4.53	%	4.69	%	—	%	—	%

Performance Shares

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of weighted-average assumptions used

Below were the assumptions used in the Monte Carlo calculation for each material award granted in 2020, 2019 and 2018:

	February 12, 2020	June 3, 2019	February 7, 2019	September 17, 2018	February 8, 2018
Expected volatility	41.0%	39.7%	36.7%	36.6%	34.8%
Expected term (in years)	2.9	2.6	2.9	3.0	3.0
Risk-free interest rate	1.41%	1.78%	2.43%	2.85%	2.28%

Schedule of restricted stock and restricted stock activity

A summary of activity of the outstanding performance-based restricted stock units for 2020, 2019 and 2018 is presented below:

	2020			2019			2018
	Awards Outstanding	Weighted- Average Grant Date Fair Value		Awards Outstanding	Weighted- Average Grant Date Fair Value		Awards Outstanding	Weighted- Average Grant Date Fair Value
Awards outstanding as of January 1	106,943	$	161.33	142,434	$	110.19	169,202	$	97.16
Awards granted	87,244	131.99		112,160	114.22		75,760	163.55
Stock issued	(75,486)	111.54		(135,032)	69.10		(81,230)	131.72
Awards forfeited	(7,642)	179.89		(12,619)	152.22		(21,298)	114.40
Awards outstanding as of December 31	111,059	$	170.84	106,943	$	161.33	142,434	$	110.19

Time Based Restricted Stock

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of restricted stock and restricted stock activity

A summary of activity of the outstanding time-based restricted stock units for 2020, 2019 and 2018 is presented below:

	2020			2019			2018
	Awards Outstanding	Weighted- Average Grant Date Fair Value		Awards Outstanding	Weighted- Average Grant Date Fair Value		Awards Outstanding	Weighted- Average Grant Date Fair Value
Awards outstanding as of January 1	101,685	$	122.68	117,476	$	116.10	173,331	$	69.10
Awards granted	58,807	116.87		62,115	126.92		46,810	143.93
Stock issued	(50,868)	111.16		(68,111)	81.53		(82,921)	84.92
Awards forfeited	(7,482)	122.87		(9,795)	116.52		(19,744)	112.06
Awards outstanding as of December 31	102,142	$	120.16	101,685	$	122.68	117,476	$	116.10

Deferred Stock Units

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of restricted stock and restricted stock activity

A summary of activity of the outstanding deferred stock units for 2020, 2019 and 2018 is presented below:

	2020			2019			2018
	Awards Outstanding	Weighted- Average Grant Date Fair Value		Awards Outstanding	Weighted- Average Grant Date Fair Value		Awards Outstanding	Weighted- Average Grant Date Fair Value
Awards outstanding as of January 1	7,150	$	170.89	8,400	$	108.86	9,250	$	109.48
Awards granted	10,400	108.88		5,950	183.40		8,400	108.86
Stock issued	(5,100)	183.40		(7,200)	108.86		(9,250)	109.48
Awards outstanding as of December 31	12,450	$	113.96	7,150	$	170.89	8,400	$	108.86