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Joint Ventures (Additional Information) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
joint_venture
Jun. 30, 2013
Jun. 30, 2014
joint_venture
Jun. 30, 2013
Schedule of Equity Method Investments [Line Items]        
Number of joint ventures that are 50% owned (entity) 2   2  
Equity income related to joint ventures $ 1,062 $ 762 $ 2,039 $ 1,291
Rogers INOAC Corporation [Member]
       
Schedule of Equity Method Investments [Line Items]        
Ownership interest in joint venture (percent) 50.00%   50.00%  
Rogers INOAC Suzhou Corporation [Member]
       
Schedule of Equity Method Investments [Line Items]        
Ownership interest in joint venture (percent) 50.00%   50.00%