Annual report pursuant to Section 13 and 15(d)

Line of Credit and Short-Term Borrowings (Details)

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Line of Credit and Short-Term Borrowings (Details) (USD $)
 1 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2011
Jun. 30, 2009
Bank
Line of Credit and Short Term Borrowings [Abstract]      
Amount of secured credit agreement     $ 250,000,000
Number of syndicate banks in agreement     7
Amount of previous credit agreement   150,000,000  
Maturity date of amended credit agreement   6/30/2015  
Maximum amount of credit facility 300,000,000 300,000,000  
Unused line of credit fee 0.375% 0.50%  
Maximum limit for letter of credit   50,000,000  
Maximum excess availability for credit agreement   40,000,000  
Commitment fees   737,500  
Syndication and commitment fees   6,700,000  
Maximum limit of borrowing under loan agreement 55,000,000 55,000,000  
Maturity date of construction loan agreement   Apr. 30, 2012  
Outstanding limit of construction loan agreement $ 47,100,000 $ 47,100,000  
Interest rate of line of credit agreement 1.00% 1.00%  
Line of credit facility Interest Rate Description   LIBOR  
Line of credit facility Interest Rate   LIBOR plus 1.00%,  
Line of credit facility Interest rate based on federal funds rate   0.50%  
Percentage of Average daily principal balance of revolving loans under the credit agreement   1.00%  
Percentage of Average daily principal balance of revolving loans under the credit agreement   1.25%  
Percentage of Average daily principal balance of revolving loans for base rate loans   1.50%  
Average daily principal balance of revolving loans under the credit agreement on LIBOR rate   2.00%  
Average daily principal balance of revolving loans under the credit agreement on Federal Funds Rate   2.25%  
Average daily principal balance of revolving loans under the credit agreement on LIBOR Loans   2.50%