Debt - Additional Information (Details) - USD ($)		12 Months Ended
	Jul. 29, 2014	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Oct. 31, 2016	Jan. 21, 2013
Debt Instrument [Line Items]
Finance Lease, Liability, Payments, Due Next Twelve Months		$ 3,200,000
Long-term Debt, Maturities, Repayments of Principal after Year Five		599,400,000
Long-term Debt, Maturities, Repayments of Principal in Year Five		4,500,000
Finance Lease, Liability, Payments, Due after Year Five		18,700,000
Long-term Debt, Maturities, Repayments of Principal in Year Four		279,500,000
Finance Lease, Liability, Payments, Due Year Five		2,800,000
Long-term Debt, Maturities, Repayments of Principal in Year Three		4,600,000
Finance Lease, Liability, Payments, Due Year Four		2,900,000
Long-term Debt, Maturities, Repayments of Principal in Year Two		4,600,000
Finance Lease, Liability, Payments, Due Year Three		3,100,000
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months		17,900,000
Finance Lease, Liability, Payments, Due Year Two		3,200,000
Amortization of deferred issuance costs on debt		$ 2,000,000	$ 1,400,000	$ 1,200,000
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate		0.00%
Long-term Debt, Gross		$ 910,500,000	818,800,000
Proceeds from Equity Method Investment, Distribution, Return of Capital		902,400,000	815,100,000
Unamortized Debt Issuance Expense		(8,100,000)	(3,700,000)
Supply chain financing, amount outstanding			20,800,000
Finance Lease, Liability		22,000,000	23,000,000
Proceeds from long-term debt, net		296,100,000	0	$ 0
Line of Credit Facility, Remaining Borrowing Capacity		217,000,000
Potential additional lines of credit		100,000,000
Long-term Line of Credit		$ 13,500,000	200,000,000
Ratio of Indebtedness to Net Capital		2.0
Long-term Debt and Lease Obligation, Current		$ 17,900,000	122,200,000
Long-term debt		$ 892,600,000	696,600,000
Debt Instrument, Repayment Terms, Percentage Of Principal		0.25%
Long-term debt		$ 884,500,000	692,900,000
Minimum
Debt Instrument [Line Items]
Debt Instrument, Repayment Terms, Asset Sales, Percentage Of Principal		0.00%
Maximum
Debt Instrument [Line Items]
Ratio of Indebtedness to Net Capital		4.25
Debt Instrument, Repayment Terms, Asset Sales, Percentage Of Principal		50.00%
London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate		3.25%
London Interbank Offered Rate (LIBOR) [Member] | Minimum
Debt Instrument [Line Items]
Interest rate spread		3.00%
London Interbank Offered Rate (LIBOR) [Member] | Maximum
Debt Instrument [Line Items]
Interest rate spread		3.25%
Base Rate [Member] | Minimum
Debt Instrument [Line Items]
Interest rate spread		2.00%
Base Rate [Member] | Maximum
Debt Instrument [Line Items]
Interest rate spread		2.25%
Wells Fargo [Member]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity						$ 200,000,000.0
Debt Extinguishment Costs, Breakage Fees		$ 1,700,000
Write off of Deferred Debt Issuance Cost		1,000,000
Line of Credit Facility, Fair Value of Amount Outstanding						135,000,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net		1,600,000
Debt Issuance Costs, Line of Credit Arrangements, Net		7,300,000
Northwest Farm Credit Services, PCA [Member]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity						200,000,000
Line of Credit Facility, Fair Value of Amount Outstanding						$ 200,000,000
Allied Bank Limited [Member]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity		250,000,000.0
Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases		15,000,000.0
Potential additional lines of credit		$ 100,000,000
Ratio of Indebtedness to Net Capital		1.1
Allied Bank Limited [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate		1.25%
Allied Bank Limited [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate		1.75%
Allied Bank Limited [Member] | Base Rate [Member] | Minimum
Debt Instrument [Line Items]
Interest rate spread		0.25%
Allied Bank Limited [Member] | Base Rate [Member] | Maximum
Debt Instrument [Line Items]
Interest rate spread		0.75%
Wells Fargo [Domain]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity		$ 200,000,000
Northwest Farm Credit [Domain]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity		200,000,000
Long-term Line of Credit		$ 100,000,000
Term of borrowing		3 years
Reported Value Measurement [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Fair Value of Amount Outstanding		$ 200,000,000
Revolving Credit Facility [Member] | Allied Bank Limited [Member]
Debt Instrument [Line Items]
Outstanding stand by letters of credit		$ 4,400,000
Loan Lending Commitment Arrangement Fees [Member] | Allied Bank Limited [Member] | Minimum
Debt Instrument [Line Items]
Interest rate spread		0.25%
Loan Lending Commitment Arrangement Fees [Member] | Allied Bank Limited [Member] | Maximum
Debt Instrument [Line Items]
Interest rate spread		0.375%
Term Loan [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate		10.00%
Term Loan [Member] | Allied Bank Limited [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 300,000,000	0
Long-term Debt		294,900,000	0
Unamortized Debt Issuance Expense		(5,100,000)	0
Long-term Line of Credit		$ 300,000,000
Line of Credit [Member] | Allied Bank Limited [Member]
Debt Instrument [Line Items]
Long-term Line of Credit					$ 58,000,000
Senior Note Due 2023 [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate		0.00%
Long-term Debt, Gross		$ 275,000,000	275,000,000
Long-term Debt		273,500,000	273,000,000
Unamortized Debt Issuance Expense		(1,500,000)	(2,000,000)
Debt instrument, principal amount							$ 275,000,000
Debt instrument, interest rate							4.50%
Senior Note Due 2023 [Member] | Estimate of Fair Value Measurement [Member]
Debt Instrument [Line Items]
Long-term Debt, Fair Value		$ 574,000,000
Senior Note Due 2025 [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate		10.00%
Long-term Debt, Gross		$ 300,000,000	300,000,000
Long-term Debt		298,500,000	298,300,000
Unamortized Debt Issuance Expense		(1,500,000)	$ (1,700,000)
Debt instrument, principal amount	$ 300,000,000
Debt instrument, interest rate	5.375%
Redemption Price	100.00%
Senior Note Due 2025 [Member] | Minimum
Debt Instrument [Line Items]
Debt Instrument Redemption Notice Term	30 days
Senior Note Due 2025 [Member] | Maximum
Debt Instrument [Line Items]
Debt Instrument Redemption Notice Term	60 days
Senior Note Due 2025 [Member] | Estimate of Fair Value Measurement [Member]
Debt Instrument [Line Items]
Long-term Debt, Fair Value		512,375,000
Commercial Credit Agreement
Debt Instrument [Line Items]
Amount of credit agreement included in short-term debt		$ 100,000,000