| **Significant Accounting Policies (Details)**                                     | 12 Months Ended |
|-----------------------------------------------------------------------------------|-----------------|
||
| **Operating Leases, Future Minimum Payments Due**                                 |            |   |   |
| 2017                                                                              | $ 7,784,000     |   |   |
| 2018                                                                              | 7,575,000       |   |   |
| 2019                                                                              | 7,370,000       |   |   |
| 2020                                                                              | 6,729,000       |   |   |
| 2021                                                                              | 6,545,000       |   |   |
| Operating Leases, Future Minimum Payments Receivable                              | $ 36,003,000    |   |   |
| Percentage of certain resort fees included in management services revenues        | 50.00%          |   |   |
| Temporary unrealized losses related to debt securities                            | $ 1,886,000     | $ 1,117,000 |   |
| Other-than-temporary impairment losses                                            | 0               | 0 | $ 1,295,000 |
| Realized gains (losses) on sale of securities                                     | $ 795,000       | 5,311,000 | (833,000) |
| Other than temporary losses, investments, portion in other comprehensive loss     |            |   | $ 1,500,000 |
| Period restricted investments are to be allocated to 401(k) plan participants     | 5 years         |   | 7 years |
| Allowance for doubtful accounts                                                   | $ 0             | 0 |   |
| Capitalized indirect costs incurred                                               | $ 0             | $ 200,000 | $ 600,000 |
| Timber holdings valuation sample                                                  | 20.00%          |   |   |
| Cash, uninsured amount                                                            | $ 40,400,000    |   |   |
| Debt securities, fair value                                                       | $ 139,132,000   |   |   |
| Common stock equivalents (in shares) | shares                                     | 0               | 0 |   |
| U.S. Treasury securities                                                          |            |   |   |
| **Operating Leases, Future Minimum Payments Due**                                 |            |   |   |
| Temporary unrealized losses related to debt securities                            |            | $ 79,000 |   |
| Corporate debt securities                                                         |            |   |   |
| **Operating Leases, Future Minimum Payments Due**                                 |            |   |   |
| Temporary unrealized losses related to debt securities                            | $ 1,769,000     | 981,000 |   |
| Debt securities, fair value                                                       | $ 139,100,000   |   |   |
| Number of issuers | issuer                                                        | 10              |   |   |
| Preferred stock                                                                   |            |   |   |
| **Operating Leases, Future Minimum Payments Due**                                 |            |   |   |
| Temporary unrealized losses related to debt securities                            | $ 111,000       | 57,000 |   |
| Commercial paper                                                                  |            |   |   |
| **Operating Leases, Future Minimum Payments Due**                                 |            |   |   |
| Debt securities, fair value                                                       | $ 129,700,000   |   |   |
| Number of issuers | issuer                                                        | 7               |   |   |
| Other Assets | Accounting Standards Update 2015-03                                |            |   |   |
| **Operating Leases, Future Minimum Payments Due**                                 |            |   |   |
| Debt issuance costs, net                                                          |            | (2,100,000) |   |
| Long-term Debt | Accounting Standards Update 2015-03                              |            |   |   |
| **Operating Leases, Future Minimum Payments Due**                                 |            |   |   |
| Debt issuance costs, net                                                          |            | 700,000 |   |
| Senior Notes Held By Special Purpose Entity | Accounting Standards Update 2015-03 |            |   |   |
| **Operating Leases, Future Minimum Payments Due**                                 |            |   |   |
| Debt issuance costs, net                                                          |            | $ 1,400,000 |   |
| External Credit Rating, Non Investment Grade | Preferred stock                    |            |   |   |
| **Operating Leases, Future Minimum Payments Due**                                 |            |   |   |
| Other marketable securities, noncurrent                                           | $ 36,600,000    |   |   |
| Number of issuers | issuer                                                        | 3               |   |   |
| Land improvements | Minimum | Real Estate                                         |            |   |   |
| **Operating Leases, Future Minimum Payments Due**                                 |            |   |   |
| Estimated useful life (in years)                                                  | 15 years        |   |   |
| Land improvements | Maximum | Real Estate                                         |            |   |   |
| **Operating Leases, Future Minimum Payments Due**                                 |            |   |   |
| Estimated useful life (in years)                                                  | 20 years        |   |   |
| Buildings | Minimum | Real Estate                                                 |            |   |   |
| **Operating Leases, Future Minimum Payments Due**                                 |            |   |   |
| Estimated useful life (in years)                                                  | 20 years        |   |   |
| Buildings | Maximum | Real Estate                                                 |            |   |   |
| **Operating Leases, Future Minimum Payments Due**                                 |            |   |   |
| Estimated useful life (in years)                                                  | 40 years        |   |   |
| Building improvements | Minimum | Real Estate                                     |            |   |   |
| **Operating Leases, Future Minimum Payments Due**                                 |            |   |   |
| Estimated useful life (in years)                                                  | 5 years         |   |   |
| Building improvements | Maximum | Real Estate                                     |            |   |   |
| **Operating Leases, Future Minimum Payments Due**                                 |            |   |   |
| Estimated useful life (in years)                                                  | 25 years        |   |   |
| Railroad and equipment | Minimum                                                  |            |   |   |
| **Operating Leases, Future Minimum Payments Due**                                 |            |   |   |
| Estimated useful life (in years)                                                  | 15 years        |   |   |
| Railroad and equipment | Maximum                                                  |            |   |   |
| **Operating Leases, Future Minimum Payments Due**                                 |            |   |   |
| Estimated useful life (in years)                                                  | 30 years        |   |   |
| Furniture and fixtures | Minimum                                                  |            |   |   |
| **Operating Leases, Future Minimum Payments Due**                                 |            |   |   |
| Estimated useful life (in years)                                                  | 5 years         |   |   |
| Furniture and fixtures | Maximum                                                  |            |   |   |
| **Operating Leases, Future Minimum Payments Due**                                 |            |   |   |
| Estimated useful life (in years)                                                  | 10 years        |   |   |
| Machinery and equipment | Minimum                                                 |            |   |   |
| **Operating Leases, Future Minimum Payments Due**                                 |            |   |   |
| Estimated useful life (in years)                                                  | 3 years         |   |   |
| Machinery and equipment | Maximum                                                 |            |   |   |
| **Operating Leases, Future Minimum Payments Due**                                 |            |   |   |
| Estimated useful life (in years)                                                  | 10 years        |   |   |
| Office equipment | Minimum                                                        |            |   |   |
| **Operating Leases, Future Minimum Payments Due**                                 |            |   |   |
| Estimated useful life (in years)                                                  | 5 years         |   |   |
| Office equipment | Maximum                                                        |            |   |   |
| **Operating Leases, Future Minimum Payments Due**                                 |            |   |   |
| Estimated useful life (in years)                                                  | 10 years        |   |   |
| Autos and trucks                                                                  |            |   |   |
| **Operating Leases, Future Minimum Payments Due**                                 |            |   |   |
| Estimated useful life (in years)                                                  | 5 years         |   |   |

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Common Stock Equivalents
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Defined Contribution Plan, Distribution Period
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Inventory, Valuation Sample, Percentage of Holdings
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Number of Issuers
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Real Estate Inventory, Capitalized Indirect Costs Incurred
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| - Definition
For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.
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| - Definition
Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.
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| - Definition
Amount of debt securities categorized neither as held-to-maturity nor trading.
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| - Definition
The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation.
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| - Definition
Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments.
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| - References
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| - Definition
Future minimum rental payments in aggregate as of the balance sheet date under operating leases.
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| - Definition
Future rental payments receivable within one year of the balance sheet date under an operating lease.
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| - Definition
Future rental payments receivable within the fifth year from the balance sheet date under an operating lease.
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| - Definition
Future rental payments receivable within the fourth year from the balance sheet date under an operating lease.
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| - Definition
Future rental payments receivable within the third year from the balance sheet date under an operating lease.
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| - Definition
Future rental payments receivable within the second year from the balance sheet date under an operating lease.
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| - Definition
Amount of debt and equity financial instruments classified as other and noncurrent.
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| - Definition
This item represents an increase to the cumulative amount of credit losses recognized in earnings for an other than temporary impairment (OTTI) of a debt security held for which no such other than temporary impairment (OTTI) was previously recognized.
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| - Definition
Amount before tax of other than temporary impairment (OTTI) on investment in available-for-sale debt security, recognized in other comprehensive loss.
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| - Definition
The percentage charged for managing real estate properties.
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| - Definition
Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.
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