| **Real Estate Sales - AgReserves Sales (Details) - USD ($)**                                                                      |                 | 1 Months Ended  | 12 Months Ended |
|-----------------------------------------------------------------------------------------------------------------------------------|-----------------|-----------------|-----------------|
||
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |            |            |            |   |   |
| Other operating expenses                                                                                                          |            |            | $ 23,019,000    | $ 33,426,000 | $ 26,128,000 |
| Investments held by special purpose entities                                                                                      | $ 203,500,000.0 |            | 208,590,000     | 208,785,000 |   |
| Debt principal amount                                                                                                             |            | $ 180,000,000   |            |   |   |
| Debt interest rate                                                                                                                |            | 4.75%           |            |   |   |
| Accrued interest receivable for Senior Notes held by SPE                                                                          |            |            | 2,938,000       | 3,338,000 |   |
| Proceeds from monetization                                                                                                        |            | $ 165,000,000.0 |            |   |   |
| Cost of monetization                                                                                                              |            | $ 15,000,000.0  |            |   |   |
| Expected amount to receive upon maturity of note after payment of note and any other liabilities                                  |            |            | 20,000,000.0    |   |   |
| Administrative costs associated with special purpose entities                                                                     |            |            | $ 0             | 0 | 3,746,000 |
| Percent ownership in special purpose entity                                                                                       |            |            | 0.00%           |   |   |
| Senior Notes held by special purpose entity                                                                                       |            |            | $ 176,310,000   | 176,094,000 |   |
| Investment income, net                                                                                                            |            |            | 8,202,000       | 8,217,000 | 6,116,000 |
| Interest expense                                                                                                                  |            |            | (8,833,000)     | $ (8,755,000) | (6,584,000) |
| Subsidiaries | Notes Receivable                                                                                                   |            |            |            |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |            |            |            |   |   |
| Issue price of senior secured notes                                                                                               |            | 98.50%          |            |   |   |
| Special Purpose Entities                                                                                                          |            |            |            |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |            |            |            |   |   |
| Accrued interest receivable for Senior Notes held by SPE                                                                          |            |            | 2,900,000       |   |   |
| Expected amount to receive upon maturity of note after payment of note and any other liabilities                                  |            |            | 16,900,000      |   |   |
| Debt discount and issuance costs                                                                                                  |            | $ 4,300,000     |            |   |   |
| Investments contributed to special purpose entity by the company                                                                  |            | $ 7,000,000     |            |   |   |
| Time deposits                                                                                                                     |            |            | 200,000,000     |   |   |
| U.S. Treasury securities                                                                                                          |            |            | 8,200,000       |   |   |
| Cash                                                                                                                              |            |            | $ 400,000       |   |   |
| Held-to-maturity security, term                                                                                                   |            |            | 13 years        |   |   |
| Held-to-maturity Securities, debt maturities, within one year                                                                     |            |            | $ 600,000       |   |   |
| Held-to-maturity Securities, debt maturities, year two through five                                                               |            |            | 2,500,000       |   |   |
| Held-to-maturity Securities, debt maturities, after five through ten years                                                        |            |            | 3,400,000       |   |   |
| Held-to-maturity Securities, debt maturities, after ten years                                                                     |            |            | $ 1,700,000     |   |   |
| Special Purpose Entities | Notes Receivable                                                                                       |            |            |            |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |            |            |            |   |   |
| Debt interest rate                                                                                                                |            |            | 4.00%           |   |   |
| Northwest Florida Timber Finance, LLC                                                                                             |            |            |            |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |            |            |            |   |   |
| Accrued interest                                                                                                                  |            |            | $ 2,900,000     |   |   |
| Senior Notes held by special purpose entity                                                                                       |            |            | 176,300,000     |   |   |
| Debt unamortized discount                                                                                                         |            |            | 3,700,000       |   |   |
| Buyer Special Purpose Entity                                                                                                      |            |            |            |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |            |            |            |   |   |
| Assets held by special purpose entity                                                                                             |            |            | 211,500,000     |   |   |
| Liabilities held by special purpose entity                                                                                        |            |            | $ 179,200,000   |   |   |
| AgReserves Sale                                                                                                                   |            |            |            |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |            |            |            |   |   |
| Consideration received for real estate sale                                                                                       | 562,000,000     |            |            |   |   |
| Pre-tax income on real estate sale                                                                                                | 511,100,000     |            |            |   |   |
| Other operating expenses                                                                                                          |            |            |            |   | $ 1,200,000 |
| Cash proceeds from sale of real estate                                                                                            | 358,500,000.0   |            |            |   |   |
| Notes received in sale of real estate                                                                                             | $ 200,000,000   |            |            |   |   |
| Maturity of notes receivables                                                                                                     | 15 years        |            |            |   |   |

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.
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Face (par) amount of debt instrument at time of issuance.
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Contractual interest rate for funds borrowed, under the debt agreement.
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Amount, after accumulated amortization, of debt discount (premium).
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Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.
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Carrying amount of debt securities accounted for as held-to-maturity, net of adjustments including, but not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized, and fair value hedge accounting adjustments, maturing in the fifth through tenth fiscal year following the latest fiscal year.
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Fair value of held-to-maturity debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.
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Carrying amount of debt securities accounted for as held-to-maturity, net of adjustments including, but not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized, and fair value hedge accounting adjustments, maturing after the tenth fiscal year following the latest fiscal year.
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Carrying amount of debt securities accounted for as held-to-maturity, net of adjustments including, but not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized, and fair value hedge accounting adjustments, maturing in the next fiscal year following the latest fiscal year.
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
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Amount of interest payable on debt, including, but not limited to, trade payables.
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Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable.
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The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation.
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Proceeds from (repayments of) securitizations of receivables treated as collateralized borrowings, which are classified as financing transactions.
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Cash received for the sale of real estate that is not part of an investing activity during the current period.
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Amount of time deposit liabilities, including certificates of deposit.
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| - Definition
Debt (bills, notes or bonds) that are issued by the government of the United States which are short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016
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