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Debt - Additional Information (Details)
$ in Thousands
 12 Months Ended
Jul. 29, 2014
USD ($)
Jul. 29, 2014
USD ($)
Jan. 23, 2013
USD ($)
Dec. 31, 2017
USD ($)
Rate
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 21, 2013
USD ($)
Debt Instrument [Line Items]                      
Proceeds from Lines of Credit       $ 298,308 $ 1,273,959 $ 0          
Accrued interest       12,723 12,149            
Credit facility, maximum borrowing capacity       300,000              
Repayments of Lines of Credit       $ 278,308 1,138,959 $ 0          
Outside equity interest percentage maximum | Rate       0.00%              
Available incremental borrowings under Credit Agreements       $ 200,000              
Available incremental borrowings under Credit Agreements, additional amount       $ 100,000              
Lien leverage ratio, maximum       3.00              
Maximum percentage of Farm Credit Agreement outstanding amount to total outstanding amount from both Credit Agreements | Rate       50.00%              
Line of Credit Facility, Fair Value of Amount Outstanding       $ 154,882 $ 135,000            
Minimum                      
Debt Instrument [Line Items]                      
Debt Instrument, Description of Variable Rate Basis       0.0125              
Line of Credit Facility, Commitment Fee Percentage | Rate       0.00%              
Maximum                      
Debt Instrument [Line Items]                      
Debt Instrument, Description of Variable Rate Basis       0.02              
Line of Credit Facility, Commitment Fee Percentage | Rate       0.00%              
Senior Notes                      
Debt Instrument [Line Items]                      
Proceeds from long-term debt     $ 271,000                
Interest rate increase [Domain]                      
Debt Instrument [Line Items]                      
Debt Instrument, Description of Variable Rate Basis       0.0025              
Contractual Interest Rate Reduction [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument, Description of Variable Rate Basis       0.01              
Senior Notes Due Twenty Twenty-five [Member]                      
Debt Instrument [Line Items]                      
Debt instrument, principal amount $ 300,000 $ 300,000                  
Debt instrument, maturity date Feb. 01, 2025                    
Debt instrument, interest rate 5.375% 5.375%                  
Proceeds from long-term debt $ 298,000                    
Redemption Price 100.00% 100.00%                  
Senior Notes Due Twenty Twenty-five [Member] | Minimum                      
Debt Instrument [Line Items]                      
Debt Instrument Redemption Notice Term   30 days                  
Senior Notes Due Twenty Twenty-five [Member] | Maximum                      
Debt Instrument [Line Items]                      
Debt Instrument Redemption Notice Term   60 days                  
Senior Notes Due Twenty Twenty-Three [Member]                      
Debt Instrument [Line Items]                      
Debt instrument, principal amount                     $ 275,000
Debt instrument, interest rate                     4.50%
Revolving Credit Facility                      
Debt Instrument [Line Items]                      
Outstanding stand by letters of credit       $ 7,600              
Credit facility available to draw       137,400              
Wells Fargo [Domain]                      
Debt Instrument [Line Items]                      
Credit facility, maximum borrowing capacity       200,000              
Northwest Farm Credit [Domain]                      
Debt Instrument [Line Items]                      
Credit facility, maximum borrowing capacity       $ 100,000              
Scenario, Forecast [Member]                      
Debt Instrument [Line Items]                      
Total leverage ratio               4.00 4.25 4.50  
Interest coverage ratio             2.25 1.75