Income Taxes (Additional Information) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Taxes [Line Items]
Tax credit carryforwards, foreign	$ 13,800,000
Tax credit carryforwards, research	4,600,000
Tax credit carryforwards, AMT	500,000
Excluded tax credit carryforwards, foreign	6,800,000
Excluded tax credit carryforwards, research	1,200,000
Excluded tax credit carryforwards, AMT	400,000
Increase in equity if deferred tax assets realized	8,400,000
Deferred tax asset valuation allowance	466,000	466,000
Income (loss) before income tax expense (benefit)	48,885,000	22,650,000	55,768,000
Undistributed foreign earnings	172,900,000	130,900,000
Income taxes paid, net of refunds	11,100,000	11,600,000	17,100,000
Unrecognized tax benefits	9,148,000	17,333,000	16,133,000
Gross decreases - tax positions in prior periods	7,136,000
Unrecognized tax benefits, interest and penalties accrued	1,100,000	2,000,000
Minimum amount of unrecognized tax benefits that could be recognized over next 12 months	1,500,000
Maximum amount of unrecognized tax benefits that could be recognized over next 12 months	2,000,000
Rogers Technologies (Suzhou) Company [Member]
Income Taxes [Line Items]
Effective income tax rate, first two years of profitable operation			0.00%
Effective tax rate		25.00%	24.00%
Income (loss) before income tax expense (benefit)			17,900,000
Rogers (Shanghai) International Trading Company Ltd [Member]
Income Taxes [Line Items]
Effective tax rate			24.00%
Income (loss) before income tax expense (benefit)			2,400,000
China [Member]
Income Taxes [Line Items]
Net operating loss carryforward, foreign	1,000,000
Minimum [Member]
Income Taxes [Line Items]
State operating loss carryforwards	0
State tax credit carryforwards	0
Maximum [Member]
Income Taxes [Line Items]
State operating loss carryforwards	11,000,000
State tax credit carryforwards	$ 4,000,000