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Investments in Foreign Joint Ventures (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Liabilities and equity:          
Total liabilities $ 12,760   $ 12,760   $ 18,710
BOMAY [Member]
          
Assets:          
Total current assets 87,127   87,127   60,817
Total non-current assets 5,025   5,025   5,163
Total assets 92,152   92,152   65,980
Liabilities and equity:          
Total liabilities 69,154   69,154   46,499
Total joint ventures' equity 22,998   22,998   19,481
Total liabilities and equity 92,152   92,152   65,980
Revenue 20,069 19,681 77,078 45,624  
Earnings 1,561 1,665 5,962 3,359  
MIEFE [Member]
          
Assets:          
Total current assets 3,726   3,726   4,459
Total non-current assets 120   120   105
Total assets 3,846   3,846   4,564
Liabilities and equity:          
Total liabilities 1,257   1,257   2,162
Total joint ventures' equity 2,589   2,589   2,402
Total liabilities and equity 3,846   3,846   4,564
Revenue 743 1,189 5,823 2,421  
Earnings 0 134 46 (147)  
AAG [Member]
          
Assets:          
Total current assets 1,983   1,983   1,604
Total non-current assets 347   347   49
Total assets 2,330   2,330   1,653
Liabilities and equity:          
Total liabilities 1,474   1,474   1,151
Total joint ventures' equity 856   856   502
Total liabilities and equity 2,330   2,330   1,653
Revenue 2,275 1,531 4,940 2,181  
Earnings $ 329 $ 274 $ 419 $ 189