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Investments in Foreign Joint Ventures (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
BOMAY [Member]
      
Assets:      
Total current assets $ 107,257   $ 91,926
Total non-current assets 5,059   5,116
Total assets 112,316   97,042
Liabilities and equity:      
Total liabilities 85,858   73,293
Total joint ventures' equity 26,458   23,749
Total liabilities and equity 112,316   97,042
Revenue 33,509 23,017  
Earnings 2,502 1,746  
MIEFE [Member]
      
Assets:      
Total current assets 4,287   3,894
Total non-current assets 115   116
Total assets 4,402   4,010
Liabilities and equity:      
Total liabilities 1,800   1,422
Total joint ventures' equity 2,602   2,588
Total liabilities and equity 4,402   4,010
Revenue 2,667 2,894  
Earnings 48 20  
AAG [Member]
      
Assets:      
Total current assets 3,695   2,241
Total non-current assets 823   776
Total assets 4,518   3,017
Liabilities and equity:      
Total liabilities 2,163   1,511
Total joint ventures' equity 2,355   1,505
Total liabilities and equity 4,518   3,016
Revenue 3,485 1,514  
Earnings $ 891 $ 129