The interest rate for investments that have an interest rate. For fixed rate investments, this indicates the fixed interest rate. If the investment has a variable interest rate, the rate stated here may be the rate that is currently relevant. In this case the "Investment, Interest Rate is Current Rate for Variable Rate Investment Flag", "Investment, Interest Rate is Discount Rate at Purchase Flag", "Investment, Interest Rate Reflects Current Yield Flag" should be used. If one of these flags are not appropriate to explain the interest rate that is indicated, then a new flag should be added or an explanation should be included in "Investment, Additional Information".

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Issue price of notes as a percent of the face value.

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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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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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Financial Instruments and Fair Value Measurements - Held by Special Purpose Entities (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2014	Dec. 31, 2018
Financial instruments and fair value measurements
Investments held by special purpose entity	$ 207,011		$ 207,384
Senior Notes held by special purpose entity	176,837		$ 176,775
Panama City Timber Finance Company, LLC \| 2014 real estate sale
Financial instruments and fair value measurements
Notes received as consideration in sale of real estate		$ 200,000
Promissory notes maturity period		15 years
Panama City Timber Finance Company, LLC \| Time deposit
Financial instruments and fair value measurements
Investments held by special purpose entity	$ 200,000
Investment interest rate (as a percent)	4.00%
Panama City Timber Finance Company, LLC \| U.S. Treasury securities
Financial instruments and fair value measurements
Investments held by special purpose entity	$ 6,600
Panama City Timber Finance Company, LLC \| Cash
Financial instruments and fair value measurements
Investments held by special purpose entity	400
Northwest Florida Timber Finance, LLC
Financial instruments and fair value measurements
Loan amount		$ 180,000
Debt interest rate (as a percent)		4.80%
Issue price of senior secured notes (as a percent)		98.50%
Senior Notes held by special purpose entity	176,800
Unamortized discount and debt issuance costs	$ 3,200