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Nominal or face amount used to calculate payments on the derivative asset.

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The percentage points added to the reference rate to compute the variable rate on the interest rate derivative.

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Description of the relevant terms of the derivative. Includes the type of instrument, risk being hedged, notional amount, counterparty, inception date, maturity date, relevant interest rates, strike price, cap price, and floor price.

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Fixed interest rate related to the interest rate derivative.

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Date the derivative contract matures, in CCYY-MM-DD format.

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Nominal volume used to calculate payments on a derivative instrument.

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Amount of the cost of borrowed funds accounted for as interest expense.

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Number of interest rate derivative instruments held by the entity at the reporting date.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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Derivative Instruments (Narrative) (Details) $ in Millions	1 Months Ended		12 Months Ended
Derivative Instruments (Narrative) (Details) $ in Millions	Dec. 31, 2017 USD ($) Derivative	Apr. 30, 2017 USD ($) MMcf	Dec. 31, 2017 USD ($) Derivative
Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Number of interest rate swap agreements \| Derivative	3		3
Notional amounts	$ 14.3		$ 14.3
LIBOR variable interest rate	6.17%		6.17%
Derivative, termination term			Fair value swaps terminate at various dates in the first quarter of 2018
Senior Notes	$ 50.0		$ 50.0
Derivative original maturity date			Nov. 30, 2019
Interest expense over the next twelve months			$ 0.2
Interest Rate Swaps [Member] \| Cash Flow Hedging [Member]
Derivatives, Fair Value [Line Items]
Number of interest rate swap agreements \| Derivative	1		1
Notional amounts	$ 27.5		$ 27.5
Swaps fixed interest rate	3.88%		3.88%
LIBOR variable interest rate	2.15%		2.15%
Interest Rate Swaps [Member] \| Senior notes [Member]
Derivatives, Fair Value [Line Items]
Derivative, termination year			2017-12
Termination cost	$ 0.4
Interest Rate Swaps [Member] \| Term Loans [Member] \| Cash Flow Hedging [Member]
Derivatives, Fair Value [Line Items]
Derivative, termination year			2026-02
Term loan debt	$ 27.5		$ 27.5
Interest Rate Swaps [Member] \| Minimum [Member]
Derivatives, Fair Value [Line Items]
Swaps fixed interest rate	8.88%		8.88%
Interest Rate Swaps [Member] \| Maximum [Member]
Derivatives, Fair Value [Line Items]
Swaps fixed interest rate	8.89%		8.89%
Commodity Contract [Member] \| Swap [Member] \| Derivatives not designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Volume of southern yellow pine in lumber price swap \| MMcf		3
Lumber price swap expiration date		Dec. 31, 2017
Realized gain on lumber price swap		$ 1.1