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LONG (Details)
 6 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2011
USD ($)
Dec. 31, 2010
USD ($)
Jun. 30, 2011
2003 multi-currency uncommitted shelf facility, U.S. dollar denominated 1 [Member]
USD ($)
Jun. 30, 2011
2003 multi-currency uncommitted shelf facility, U.S. dollar denominated 2 [Member]
USD ($)
Jun. 30, 2011
2003 multi-currency uncommitted shelf facility, Japanese yen denominated 1 [Member]
USD ($)
Jun. 30, 2011
2003 multi-currency uncommitted shelf facility, Japanese yen denominated 1 [Member]
JPY (¥)
Jun. 30, 2011
2003 multi-currency uncommitted shelf facility, Japanese yen denominated 3 [Member]
USD ($)
Jun. 30, 2011
2003 multi-currency uncommitted shelf facility, Japanese yen denominated 3 [Member]
JPY (¥)
Jun. 30, 2011
2003 multi-currency uncommitted shelf facility, total Japanese yen-denominated debt [Member]
USD ($)
Jun. 30, 2011
2003 multi-currency uncommitted shelf facility, Total [Member]
USD ($)
Jun. 30, 2011
2010 committed loan, U.S. dollar denominated [Member]
USD ($)
Jun. 30, 2011
Multi Currency Uncommitted Shelf Facility Japanese Yen Denominated 2 Member [Member]
USD ($)
Jun. 30, 2011
Multi Currency Uncommitted Shelf Facility Japanese Yen Denominated 2 Member [Member]
JPY (¥)
Jun. 30, 2011
Revcolving Credit Facility Member [Member]
USD ($)
Jun. 30, 2011
Uncommitted Multi Currency Shelf Facility Member [Member]
USD ($)
Debt Instrument [Line Items]                              
Original principal amount - facilities     $ 40,000,000 $ 20,000,000   ¥ 3,100,000,000   ¥ 2,200,000,000   $ 205,000,000 $ 30,000,000   ¥ 2,300,000,000 $ 25,000,000 $ 100,000,000
Balance - facilities     34,300,000 17,100,000 16,600,000 1,300,000,000 23,200,000 1,900,000,000     27,000,000 28,100,000 2,300,000,000 0 0
Interest rate - facilities (in hundredths)     6.20% 6.20% 1.70% 1.70% 3.30% 3.30%       2.60% 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 January 2017, with annual principal payments that began in January 2011      
Notes due September 2017, with annual principal payments beginning September 2011.
Notes due September 2017, with annual principal payments beginning September 2011.
    
Interest rate description - other borrowings                   Variable 30 day          
Interest rate - other borrowings (in hundredths)                     1.25%        
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% 65.00%
Current portion of long-term debt $ 27,972,000 $ 27,865,000 $ 12,400,000           $ 9,600,000   $ 6,000,000