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Debt (Details Textual) (USD $)
12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 0 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
UNITED STATES
Dec. 31, 2013
InsurancePremiumFinanced [Member]
UNITED STATES
Dec. 31, 2013
Domestic Line of Credit [Member]
Letter of Credit [Member]
UNITED STATES
Dec. 31, 2012
Domestic Line of Credit [Member]
Letter of Credit [Member]
UNITED STATES
Dec. 31, 2013
Foreign Line of Credit [Member]
Brazil [Member]
Dec. 31, 2013
Foreign Line of Credit [Member]
India [Member]
Dec. 31, 2013
Foreign Line of Credit [Member]
Letter of Credit [Member]
Dec. 31, 2012
Foreign Line of Credit [Member]
Letter of Credit [Member]
Dec. 31, 2013
Pnc Bank [Member]
Revolving Credit Facility [Member]
UNITED STATES
Dec. 31, 2013
Pnc Bank [Member]
Revolving Credit Facility [Member]
UNITED STATES
Dec. 31, 2013
Pnc Bank [Member]
Revolving Credit Facility [Member]
UNITED STATES
Dec. 31, 2013
Pnc Bank [Member]
Secured Debt [Member]
UNITED STATES
Dec. 31, 2013
Pnc Bank [Member]
Letter of Credit [Member]
UNITED STATES
Dec. 31, 2013
Secured Debt [Member]
Pnc Bank [Member]
UNITED STATES
Sep. 30, 2013
Loans Payable [Member]
UNITED STATES
Dec. 31, 2013
Capital Lease Obligations [Member]
Dec. 31, 2013
Secured loan, Mississippi Development Authority [Member]
Secured Debt [Member]
UNITED STATES
Dec. 31, 2013
London Interbank Offered Rate (LIBOR) [Member]
Pnc Bank [Member]
Revolving Credit Facility [Member]
UNITED STATES
Jan. 07, 2014
Subsequent Event [Member]
Pnc Bank [Member]
Revolving Credit Facility [Member]
UNITED STATES
Short-term Debt [Line Items]                                            
Revolving line of credit maximum borrowing capacity               $ 47,800,000 $ 12,600,000       $ 34,000,000.0   $ 15,000,000.0 $ 10,000,000.00       $ 1,500,000    
Debt Instrument, Term                             60 months              
Line of Credit Facility, Periodic Payment, Principal                             250,000              
Extinguishment of Debt, Amount                       2,300,000                    
Debt Instrument, Description of Variable Rate Basis                                         LIBOR  
Letters of Credit Outstanding, Amount           3,200,000 3,400,000     7,900,000 8,700,000                      
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate                                       2.25%    
Long-term Debt, Gross                                   1,000,000        
Line of Credit Facility, Expiration Date                         Dec. 11, 2018                  
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage                         0.375%                  
Repayments of Lines of Credit                                           2,000,000.0
Consolidated borrowings               28,600,000 11,300,000         8,000,000     15,000,000     1,100,000    
Line of Credit Facility, Remaining Borrowing Capacity               19,200,000 1,300,000       1,100,000   12,700,000.0              
Capital Lease Obligations                                     1,800,000      
Debt Issuance Costs 200,000 0 300,000 200,000                                    
Unamortized Debt Issuance Expense       100,000                                    
Amortization of Debt Financing Costs Term       5 years                                    
Other Short-term Borrowings         400,000                                  
Debt and Capital Lease Obligations $ 67,200,000 $ 61,400,000                                        
Interest rate for borrowings 8.10% 8.80%