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Credit Facilities, Short-term Borrowings and Long-term Debt (Narrative) (Details) (USD $)
 3 Months Ended 3 Months Ended
Mar. 31, 2012
Sep. 30, 2011
Mar. 31, 2011
Sep. 30, 2010
Mar. 31, 2012
Various Foreign Credit Facilities [Member]
Mar. 31, 2012
Chinese Credit Facility [Member]
Mar. 31, 2012
Chinese Credit Facility [Member]
Mar. 31, 2012
Chinese Credit Facility [Member]
RMB Loan [Member]
Dec. 31, 2011
Second Amended and Restated Credit Agreement [Member]
Sep. 30, 2011
Second Amended and Restated Credit Agreement [Member]
Mar. 31, 2012
Third Amended and Restated Credit Agreement [Member]
Mar. 31, 2012
Minimum [Member]
Third Amended and Restated Credit Agreement [Member]
Mar. 31, 2012
Maximum [Member]
Third Amended and Restated Credit Agreement [Member]
Maximum borrowing capacity           $ 5,000,000     $ 225,000,000   $ 400,000,000    
Option to increase maximum borrowings to this amount                 350,000,000   600,000,000    
Line of Credit Facility, Expiration Date                 October 2012   January 2017    
Variable Rate Basis             lender's cost of borrowing rate at the date of borrowing prevailing interest rate offered by the People's Bank of China on the date of borrowing LIBOR, the federal funds rate, or the prime rate   LIBOR    
Basis Spread On Variable Rate             3.00%         0.95% 1.525%
Basis Spread on Variable Rate               margin equal to 25% of that prevailing rate          
Revolving credit facility effective interest rate on outstanding borrowing           7.45%         1.29%    
Cross default provisions related to the Company's other outstanding debt arrangements in excess of this amount, the occurrence of which would permit the lenders to accelerate the amounts due thereunder                     30,000,000    
Debt Covenant, Minimum Consolidated Net Worth Calculation, Base Value                     725,000,000    
Debt Covenant, Minimum Consolidated Net Worth Calculation, Percentage of Net Income                     50.00%    
Debt Covenant, Minimum Consolidated Net Worth Calculation, Percentage of Net Proceeds of Issuance of Capital Stock                     50.00%    
Deferred financing costs                     2,185,000    
Accelerated amortization of debt financing costs recognized as interest expense                 100,000        
Outstanding borrowings           5,000,000       0 27,500,000    
Short-term borrowings 32,500,000 0                      
Cash and cash equivalents 56,329,000 74,539,000 60,819,000 105,579,000                  
Total debt outstanding 443,228,000                        
Additional borrowing availability         $ 15,351,000           $ 365,728,000