Shareholders' Equity and Stock Options (Tables)

12 Months Ended

Dec. 31, 2015

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:

	December 31, 2015	December 31, 2014
Stock acquisition program	120,883	120,883
Stock options and restricted stock	678,904	862,040
Shares available for issuance	1,079,491	1,176,882
Rogers Employee Savings and Investment Plan	169,044	169,044
Rogers Corporation Global Stock Ownership Plan for Employees	153,357	166,152
Deferred compensation to be paid in stock	13,239	13,248
Total	2,214,918	2,508,249

Weighted average assumptions used to calculate fair value of options granted

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Activity under our stock option plans

A summary of the activity under our stock option plans for the fiscal years ended 2015, 2014 and 2013, is presented below:

	2015				2014				2013
	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	393,347		$	40.72	893,139		$	43.23	1,765,947		$	40.58
Options exercised	(178,759	)	40.90		(476,793	)	44.60		(847,340	)	37.82
Options forfeited	(2,550	)	40.09		(22,999	)	57.07		(25,468	)	39.04
Outstanding at year-end	212,038		40.47		393,347		40.72		893,139		43.23
Options exercisable at year-end	204,394				364,770				721,645

A summary of the activity under our stock option plans as of December 31, 2015 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, 2014	393,347		$	40.72	3.8	16,019,130
Options exercised	(178,759	)	40.90
Options forfeited	(2,550	)	40.09
Options outstanding at December 31, 2015	212,038		40.47		3.2	2,557,193
Options exercisable at December 31, 2015	204,394		40.44		3.1	2,478,456
Options vested at December 31, 2015 or expected to vest*	211,809		40.50		3.2	2,554,831

* In addition to the vested options, we expect a portion of the unvested options to vest at some point in the future. Options expected to vest are calculated by applying an estimated forfeiture rate to the unvested options.

Schedule of weighted-average assumptions used

Weighted-average assumptions used to determine benefit obligations at December 31:

	Pension Benefits				Retirement Health and Life Insurance Benefits
	2015		2014		2015		2014
Discount rate	4.25	%	4.00	%	3.00	%	3.00	%

Weighted-average assumptions used to determine net benefit cost for the years ended:

	Pension Benefits				Retirement Health and Life Insurance Benefits
	2015		2014		2015		2014
Discount rate	4.00	%	4.75	%	3.00	%	3.25	%
Expected long-term rate of return on plan assets	6.50	%	7.50	%	—		—

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:

	2015		2014
Expected volatility	28.2	%	33.7	%
Expected term (in years)	3		3
Risk-free interest rate	0.96	%	0.67	%

Schedule of restricted stock and restricted stock activity

A summary of activity under the performance-based restricted stock plans for the fiscal years ended 2015, 2014 and 2013 is presented below:

	2015				2014				2013
	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	92,437		$	52.75	71,175		$	47.49	73,458		$	38.01
Awards granted	51,475		78.01		51,850		58.61		47,625		47.10
Stock issued	(20,910	)	41.27		(14,383	)	47.89		(33,538	)	27.43
Awards forfeited or expired	(15,773	)	59.45		(16,205	)	52.71		(16,370	)	44.90
Non-vested awards outstanding at end of year	107,229		$	66.13	92,437		$	52.75	71,175		$	47.49

Time Based Restricted Stock

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

Schedule of restricted stock and restricted stock activity

	2015				2014				2013
	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	238,386		$	53.80	231,026		$	48.54	115,139		$	43.27
Awards granted	75,160		77.15		93,780		61.7		156,665		51.78
Stock issued	(93,813	)	48.35		(62,378	)	47.19		(12,436	)	43.97
Awards forfeited or expired	(11,415	)	61.32		(24,042	)	51.19		(28,342	)	47.07
Non-vested awards outstanding at end of year	208,318		$	64.27	238,386		$	53.80	231,026		$	48.54

Deferred Stock Units

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

Schedule of restricted stock and restricted stock activity

	2015				2014				2013
	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	30,150		$	24.43	31,550		$	26.77	30,150		$	26.13
Awards granted	10,300		73.79		14,700		58.45		16,800		41.67
Stock issued	(16,500	)	51.20		(16,100	)	60.08		(15,400	)	41.77
Non-vested awards outstanding at end of year	23,950		$	27.22	30,150		$	24.43	31,550		$	26.77