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Investments in Foreign Joint Ventures (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Liabilities and equity:          
Total liabilities $ 12,393   $ 12,393   $ 18,710
BOMAY [Member]
          
Assets:          
Total current assets 79,281   79,281   60,817
Total non-current assets 5,064   5,064   5,163
Total assets 84,345   84,345   65,980
Liabilities and equity:          
Total liabilities 62,869   62,869   46,499
Total joint ventures' equity 21,476   21,476   19,481
Total liabilities and equity 84,345   84,345   65,980
Revenue 33,991 8,253 57,009 25,943  
Earnings 2,655 969 4,401 1,694  
MIEFE [Member]
          
Assets:          
Total current assets 4,624   4,624   4,459
Total non-current assets 121   121   105
Total assets 4,745   4,745   4,564
Liabilities and equity:          
Total liabilities 2,243   2,243   2,162
Total joint ventures' equity 2,502   2,502   2,402
Total liabilities and equity 4,745   4,745   4,564
Revenue 2,185 619 5,080 1,232  
Earnings 30 (230) 50 (281)  
AAG [Member]
          
Assets:          
Total current assets 1,430   1,430   1,604
Total non-current assets 182   182   49
Total assets 1,612   1,612   1,653
Liabilities and equity:          
Total liabilities 1,082   1,082   1,151
Total joint ventures' equity 530   530   502
Total liabilities and equity 1,612   1,612   1,653
Revenue 1,152 451 2,665 650  
Earnings $ (39) $ (29) $ 90 $ (85)