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Borrowings - Additional Information (Details) |  |  | 3 Months Ended | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) agreement | Feb. 04, 2021 USD ($) | Jun. 30, 2021 USD ($) agreement | Mar. 31, 2021 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) agreement | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 10, 2020 USD ($) | Feb. 20, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 05, 2014 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net cost basis | $ 1,122,361,000 |  | $ 1,122,361,000 |  |  |  | $ 1,122,361,000 |  |  |  |  |  |
Other income |  |  | 20,000 |  |  | $ 21,000 | 2,255,000 | $ 1,345,000 |  |  |  |  |
Borrowings under lines of credit | 100,000 |  | 100,000 |  |  |  | 100,000 |  | $ 100,000 |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net cost basis | $ 1,000,000,000.0 |  | $ 1,000,000,000.0 |  |  |  | $ 1,000,000,000.0 |  |  |  |  |  |
Weighted average interest rate (as percent) |  |  | 3.73% |  |  | 3.98% | 3.71% | 3.98% |  |  |  |  |
Farm Credit Notes Payable |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, increase (decrease) (as percent) |  |  |  |  |  |  | 28.70% | 28.70% |  |  |  |  |
Basis spread on variable rate, increase (decrease) (as percent) |  |  |  |  |  |  | 1.35% | 1.35% |  |  |  |  |
Number of loan agreements | agreement | 13 |  | 13 |  |  |  | 13 |  |  |  |  |  |
Other income |  |  |  | $ 2,200,000 | $ 306,000 |  | $ 2,500,000 |  |  |  |  |  |
MetLife Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  |  |  |  | $ 200,000,000.0 |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  | 75,000,000.0 |
MetLife Facility | Notes and bonds payables |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt | $ 75,000,000 |  | $ 75,000,000 |  |  |  | 75,000,000 |  |  |  | $ 75,000,000.0 |  |
Undrawn commitment | $ 38,100,000 |  | $ 38,100,000 |  |  |  | $ 38,100,000 |  |  |  |  | $ 21,500,000 |
Debt Instrument, Interest Rate, Stated Percentage | 2.75% |  | 2.75% |  |  |  | 2.75% |  |  |  |  |  |
Farmer Mac Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  | $ 2,460,000 |  |  |  |  |  |  |  | $ 225,000,000.0 |  |  | $ 125,000,000.0
Secured debt | $ 92,100,000 |  | $ 92,100,000 |  |  |  | $ 92,100,000 |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 3.13% |  |  |  |  |  |  |  |  |  |  |
Principal amortization term (in years) |  | 25 years |  |  |  |  |  |  |  |  |  |  |
Mortgage Notes and Bonds Payable | Notes and bonds payables |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value amount | 628,600,000 |  | 628,600,000 |  |  |  | 628,600,000 |  |  |  |  |  |
Secured debt | 630,900,000 |  | 630,900,000 |  |  |  | 630,900,000 |  |  |  |  |  |
Short Term Mortgage Notes And Bonds Payable | Notes and bonds payables |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings under lines of credit | 100,000 |  | 100,000 |  |  |  | 100,000 |  |  |  |  |  |
Golden State Farm Credit Loan |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt | $ 22,800,000 |  | $ 22,800,000 |  |  |  | $ 22,800,000 |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.75% |  | 3.75% |  |  |  | 3.75% |  |  |  |  |  |
Principal amortization term (in years) | 10 years |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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- Definition Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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