Shareholders' Equity and Stock Options (Tables)

12 Months Ended

Dec. 31, 2017

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



	As of December 31,
	2017	2016
Shares reserved for issuance under the stock acquisition program ⁽¹⁾	120,883	120,883
Shares reserved for issuance under outstanding stock options and restricted stock unit awards	545,018	659,302
Additional shares reserved for issuance under Rogers Corporation 2009 Long-Term Equity Compensation Plan	793,603	892,163
Shares reserved for issuance under the Rogers Employee Savings and Investment Plan ⁽²⁾	169,044	169,044
Shares reserved for issuance under the Rogers Corporation Global Stock Ownership Plan for Employees	117,987	133,113
Deferred compensation to be paid in stock, including deferred stock units	17,100	22,752
Total	1,763,635	1,997,257


⁽¹⁾	As of December 31, 2017, the Company no longer offers capital stock under the stock acquisition program.


⁽²⁾	As of December 31, 2017, the Company no longer offers its capital stock as an investment option under the Rogers Employee Savings and Investment Plan.

A summary of the activity under our stock option plans for the fiscal years ended 2017, 2016 and 2015, is presented below:



	2017				2016				2015
	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	116,575		$	37.76	212,038		$	40.47	393,347		$	40.72
Options exercised	(83,292	)	37.04		(95,113	)	43.56		(178,759	)	40.90
Options forfeited	—		—		(350	)	44.32		(2,550	)	40.09
Outstanding at year-end	33,283		36.40		116,575		37.76		212,038		40.47
Options exercisable at year-end	33,283				116,575				204,394

A summary of the activity under our stock option plans as of December 31, 2017 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, 2016	116,575		$	37.76	3.2	4,552,580
Options exercised	(83,292	)	37.04
Options forfeited	—		—
Options outstanding at December 31, 2017	33,283		36.40		2.2	4,177,655
Options exercisable at December 31, 2017	33,283		36.40		2.2	4,177,655
Options vested at December 31, 2017	33,283		36.40		2.2	4,177,655

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



	Pension Benefits				Retirement Health and Life Insurance Benefits
	2017		2016		2017		2016
Discount rate	3.70	%	4.25	%	3.25	%	3.25	%

Weighted-average assumptions used to determine net benefit cost for the years ended December 31:



	Pension Benefits				Retirement Health and Life Insurance Benefits
	2017		2016		2017		2016
Discount rate	3.70	%	4.25	%	3.25	%	3.00	%
Expected long-term rate of return on plan assets	4.94	%	5.51	%	—		—

Below were the assumptions used in the Monte Carlo calculation:

A summary of activity under the performance-based restricted stock units plans for the fiscal years ended 2017, 2016 and 2015 is presented below:



	2017				2016				2015
	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	151,769		$	89.72	107,229		$	66.13	92,437		$	52.75
Awards granted	56,147		110.77		84,443		69.01		51,475		78.01
Stock issued	(34,442	)	86.59		(25,397	)	72.68		(20,910	)	41.27
Awards forfeited or expired	(4,272	)	99.35		(14,506	)	104.83		(15,773	)	59.45
Non-vested awards outstanding at end of year	169,202		$	97.16	151,769		$	89.72	107,229		$	66.13



	2017				2016				2015
	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	239,189		$	57.71	208,318		$	64.27	238,386		$	53.80
Awards granted	80,535		83.17		118,660		51.70		75,160		77.15
Stock issued	(140,208	)	58.18		(60,326	)	64.03		(93,813	)	48.35
Awards forfeited or expired	(6,185	)	60.70		(27,463	)	64.60		(11,415	)	61.32
Non-vested awards outstanding at end of year	173,331		$	69.10	239,189		$	57.71	208,318		$	64.27



	2017				2016				2015
	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 at beginning of year	11,900		$	58.82	23,950		$	27.22	30,150		$	24.43
Awards granted	9,250		109.48		11,900		58.82		10,300		73.79
Stock issued	(11,900	)	109.36		(23,950	)	52.69		(16,500	)	51.20
Awards outstanding at end of year	9,250		$	109.48	11,900		$	58.82	23,950		$	27.22