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LONG (Details)
 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended
Mar. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Mar. 31, 2012
2003 multi-currency uncommitted shelf facility, U.S. dollar denominated 1 [Member]
USD ($)
Mar. 31, 2012
2003 multi-currency uncommitted shelf facility, U.S. dollar denominated 2 [Member]
USD ($)
Mar. 31, 2011
2003 multi-currency uncommitted shelf facility, U.S. dollar denominated 2 [Member]
USD ($)
Mar. 31, 2012
2003 multi-currency uncommitted shelf facility, Japanese yen denominated 1 [Member]
USD ($)
Mar. 31, 2012
2003 multi-currency uncommitted shelf facility, Japanese yen denominated 1 [Member]
JPY (¥)
Mar. 31, 2011
2003 multi-currency uncommitted shelf facility, Japanese yen denominated 1 [Member]
JPY (¥)
Mar. 31, 2012
2003 multi-currency uncommitted shelf facility, Japanese yen denominated 3 [Member]
JPY (¥)
Mar. 31, 2012
2003 multi-currency uncommitted shelf facility, total Japanese yen-denominated debt [Member]
USD ($)
Mar. 31, 2012
2003 multi-currency uncommitted shelf facility, Total [Member]
USD ($)
Mar. 31, 2011
2010 committed loan, U.S. dollar denominated [Member]
USD ($)
Mar. 31, 2012
2010 committed loan, U.S. dollar denominated [Member]
USD ($)
Mar. 31, 2012
Multi Currency Uncommitted Shelf Facility Japanese Yen Denominated 2 Member [Member]
JPY (¥)
Mar. 31, 2012
Revcolving Credit Facility Member [Member]
USD ($)
Debt Instrument [Line Items]                              
Original principal amount - facilities     $ 40,000,000 $ 20,000,000 $ 20,000,000   ¥ 3.1   ¥ 2.2   $ 205,000,000     ¥ 2.3 $ 25,000,000
Balance - facilities     28,600,000 14,300,000   16,100,000 1.3 1.3 1.6         1.9 0
Interest rate - facilities (in hundredths)     6.20% 6.20%   1.70% 1.70%   3.30%         2.60%  
Repayment terms    
Notes due July 2016 with annual principal payments that began in July 2010.
Notes due January 2017 with annual principal payments that began in January 2011.
  
Notes due April 2014 with annual principal payments that began in April 2008.
Notes due April 2014 with annual principal payments that began in April 2008.
  
Notes due January 2017 with annual principal payments that began in January 2011.
        
Notes due September 2017 with annual principal payments that began in September 2011.
  
Original principal amount - other borrowings                         30,000,000    
Balance - other borrowings                       24,000,000 22,500,000    
Interest rate description - other borrowings                      
Variable 30 day: 1.24%
      
Interest rate - other borrowings (in hundredths)                         1.24%    
Amortization per quarter                         1,500,000    
Percentage of outstanding stock of material foreign subsidiaries pledged as security (in hundredths)                     65.00%   65.00%   65.00%
Current portion of long-term debt $ 27,608,000 $ 28,608,000               $ 13,000,000     $ 6,000,000