Income Taxes - Income Tax Expense (Benefit) Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Tax Disclosure [Abstract]
Tax at the federal statutory rate	$ 3,005	$ 1,280	$ 11,167	$ 6,424
State income taxes (net of federal benefit)	301	128	1,117	642
Tax effect of timber at the federal statutory rate of 23.8%	(194)	(121)	(420)	(381)
Decrease in valuation allowance	(250)	(350)	(846)	(713)
Other	(219)	11	(187)	(802)
Total income tax expense	$ 2,643	$ 948	$ 10,831	$ 5,170
Federal statutory rate			35.00%	35.00%
Timber statutory federal rate			23.80%	23.80%

Effective Income Tax Rate Reconciliation, at Timber Transactions Income Tax Rate, Percent

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Effective Income Tax Reconciliation, Timber Taxes, Amount

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of current tax expense (benefit) and deferred tax expense (benefit) pertaining to income (loss) from continuing operations and income (loss) from discontinued operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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