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Long-Term Debt and Revolving Lines of Credit (Details) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Debt Instrument [Line Items]          
Debt     $ 232,177,000 $ 180,575,000  
Current maturities     1,977,000 21,913,000  
Total long-term debt     230,200,000 158,662,000  
Percentage of aggregate principal balance on which Entity Obtain Interest Rate Protection (in hundredths)     33.00%    
Weighted average interest rate (in hundredths)     2.99%    
Number of Additional Farm Credit Institutions     16    
Number of facilities included in Credit Agreement     3    
Number of term loans included in Credit Agreement     2    
Aggregate principal amount of incremental term loan facilities, maximum     100,000,000    
Derivative liability, fair value     1,700,000 452,000  
Percentage of principal amount of loan on which entity entered in pay fixed receive fixed interest rate swap (in hundredths)     76.00%    
Derivative fixed interest rate (in hundredths)     3.88%    
Derivative, expiry date     Jul. 31, 2013    
Percentage of outstanding principal balance of loan covered under existing pay fixed receive variable interest rate swap agreement (in hundredths)     25.00%    
Derivative fixed interest rate on amended agreement (in hundredths)     4.00%    
Write-off of unamortized loan fees     780,000 0 0
Aggregate maturities of long-term debt [Abstract]          
2013     1,977,000    
2014     5,750,000    
2015     23,000,000    
2016     23,000,000    
2017     23,000,000    
Later years     155,450,000    
Long-term Debt, Total     232,177,000 180,575,000  
Percentage of outstanding debt balance (in hundredths) 40.00%        
Patronage credit basis points on outstanding debt balance 100 100      
Basis point accrued in anticipation of early distribution of credit     100    
Percentage of patronage credit paid in cash     65.00%    
CoBank (term loan) [Member]
         
Debt Instrument [Line Items]          
Debt     1,876,000 4,524,000  
Interest rate (in hundredths)     7.37%    
Face amount of debt     1,900,000    
Required periodic installments     235,000    
Aggregate maturities of long-term debt [Abstract]          
Long-term Debt, Total     1,876,000 4,524,000  
CoBank Term Loan A [Member]
         
Debt Instrument [Line Items]          
Debt     230,000,000 175,565,000  
Interest rate (in hundredths)     2.96%    
Basis spread on variable rate (in hundredths)     2.75%    
Face amount of debt     230,000,000    
Required periodic installments     5,750,000    
Expected final payment     120,750,000    
Maturity date     Sep. 30, 2019    
Trailing month basis of financial covenants     12    
Minimum debt service coverage ratio     2.50    
Aggregate maturities of long-term debt [Abstract]          
Long-term Debt, Total     230,000,000 175,565,000  
CoBank Term Loan A [Member] | Amendment date through December 31, 2013 [Member]
         
Debt Instrument [Line Items]          
Basis spread on variable rate (in hundredths)     0.21%    
Minimum equity to assets ratio     0.30    
CoBank Term Loan A [Member] | Through December 31, 2014 [Member]
         
Debt Instrument [Line Items]          
Minimum equity to assets ratio     0.325    
CoBank Term Loan A [Member] | January 1, 2015 and Thereafter [Member]
         
Debt Instrument [Line Items]          
Minimum equity to assets ratio     0.35    
CoBank Term Loan A [Member] | December 31, 2012 to March 31, 2014 [Member]
         
Debt Instrument [Line Items]          
Ratio of indebtedness to EBITDA     3.00    
CoBank Term Loan A [Member] | April 1, 2014 through March 31, 2015 [Member]
         
Debt Instrument [Line Items]          
Ratio of indebtedness to EBITDA     2.50    
CoBank Term Loan A [Member] | April 1, 2015 and Thereafter [Member]
         
Debt Instrument [Line Items]          
Ratio of indebtedness to EBITDA     2.00    
Other Debt [Member]
         
Debt Instrument [Line Items]          
Debt     301,000 486,000  
Aggregate maturities of long-term debt [Abstract]          
Long-term Debt, Total     301,000 486,000  
Revolving Credit Facility [Member]
         
Debt Instrument [Line Items]          
Maximum borrowing capacity     $ 50,000,000