| Short-Term Borrowings and Credit Lines (Narrative) (Details) | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dec. 31, 2014
 USD ($) | Dec. 31, 2014
 Domestic [Member]
 Unsecured And Uncommitted Line Of Credit [Member]
 USD ($) | Dec. 31, 2013
 Domestic [Member]
 Unsecured And Uncommitted Line Of Credit [Member]
 USD ($) | Dec. 31, 2014
 Canadian Subsidiary [Member]
 Unsecured And Uncommitted Line Of Credit [Member]
 USD ($) | Dec. 31, 2014
 Canadian Subsidiary [Member]
 Unsecured And Uncommitted Line Of Credit [Member]
 CAD | Dec. 31, 2013
 Canadian Subsidiary [Member]
 Unsecured And Uncommitted Line Of Credit [Member]
 USD ($) | Dec. 31, 2014
 European Subsidiary [Member]
 USD ($) | Dec. 31, 2013
 European Subsidiary [Member]
 USD ($) | Dec. 31, 2014
 European Subsidiary [Member]
 Unsecured And Uncommitted Line Of Credit [Member]
 USD ($) | Dec. 31, 2014
 European Subsidiary [Member]
 European Customs Guaranteed Line Of Credit [Member]
 USD ($) | Dec. 31, 2014
 European Subsidiary [Member]
 Unsecured And Uncommitted Credit Line1 [Member]
 EUR (€) | Dec. 31, 2014
 European Subsidiary [Member]
 Unsecured And Uncommitted Credit Line2 [Member]
 EUR (€) | Dec. 31, 2014
 Japanese Subsidiary [Member]
 Unsecured And Uncommitted Line Of Credit [Member]
 USD ($) | Dec. 31, 2014
 Japanese Subsidiary [Member]
 Unsecured And Uncommitted Credit Line1 [Member]
 USD ($) | Dec. 31, 2014
 Japanese Subsidiary [Member]
 Unsecured And Uncommitted Credit Line2 [Member]
 JPY (¥) | Dec. 31, 2014
 Japanese Subsidiary [Member]
 Revolving Line Of Credit [Member]
 USD ($) | Dec. 31, 2013
 Japanese Subsidiary [Member]
 Revolving Line Of Credit [Member]
 USD ($) | Dec. 31, 2014
 Korean Subsidiary [Member]
 USD ($) | Dec. 31, 2013
 Korean Subsidiary [Member]
 USD ($) | Dec. 31, 2014
 Korean Subsidiary [Member]
 Unsecured And Uncommitted Line Of Credit [Member]
 USD ($) | Dec. 31, 2014
 Committed Portion Of Credit Facility [Member]
 Domestic [Member] | Dec. 31, 2014
 Minimum [Member]
 Domestic [Member]
 Committed Line Of Credit [Member] | Dec. 31, 2014
 Maximum [Member]
 Domestic [Member]
 Committed Line Of Credit [Member] | |
| Line of Credit Facility [Line Items] | |||||||||||||||||||||||
| Interest rate description | Canadian prime rate | Canadian prime rate | European Central Bank ("ECB") refinancing rate plus 50 basis points | Euro Overnight Index Average ("EONIA") plus 75 basis points | JPY LIBOR plus 100 basis points | Bank of Tokyo Prime Rate | CD rate plus 220 basis points | USD LIBOR plus 87.5 basis points | USD LIBOR plus 162.5 basis points | ||||||||||||||
| Line of credit facility amount outstanding | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | |||||||||||||
| Available credit amount | 125,000,000 | ||||||||||||||||||||||
| Maturity date of agreement | Jul. 01, 2019 | ||||||||||||||||||||||
| Maximum borrowing capacity | $ 25,815,000 | 30,000,000 | $ 37,261,000 | $ 2,782,000 | € 25,800,000 | € 5,000,000 | $ 9,505,000 | $ 7,000,000 | ¥ 300,000,000 | $ 20,000,000 | |||||||||||||