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Debt (Details) Part 1 (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Debt Instrument    
Total Debt $ 28,212 $ 31,803
Less: Current Portion (3,640) (3,803)
Long-Term Portion 24,572 28,000
Committed lines of credit 125,000  
Uncommitted lines of credit 87,738  
Letters of Credit Outstanding 2,460  
Bank guarantees 341  
Commitment fees on unused line of credit 158  
Covenant restriction, maximum indebtedness to EBITDA 3.00 to 1  
Covenant restriction, minimum EBITDA to interest expense 3.50 to 1  
Indebtedness to EBITDA ratio 0.36 to 1  
EBITDA to interest expense ratio 49.02 to 1  
Bank borrowings
    
Debt Instrument    
Total Debt 4 9
Credit facility borrowings, Long-Term
    
Debt Instrument    
Total Debt 28,000 30,000
Collateralized borrowings
    
Debt Instrument    
Total Debt 10 11
Capital lease obligations
    
Debt Instrument    
Total Debt 198 283
Credit facility borrowings, Short-Term
    
Debt Instrument    
Total Debt $ 0 $ 1,500