Income Taxes - Expense (benefit) reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Income Taxes
Statutory federal income tax rate (as a percent)			21.00%	35.00%	35.00%
Tax at the statutory federal rate	$ 6,875	$ 5,836	$ 6,982	$ 8,162
State income taxes (net of federal benefit)	1,423	583	1,445	816
2017 qualified timber gains at the federal statutory rate of 23.8% (1)			(524)
Decrease in valuation allowance, net	(1,418)	(316)	(1,451)	(596)
Other	(333)	(194)	(154)	(194)
Income tax (benefit) expense	$ 6,547	$ 5,909	$ 6,298	$ 8,188
Timber statutory federal rate		23.80%		23.80%

Preferential tax rate on C Corporation Qualified Timber Gains under the Bipartisan Budget Act of 2018.

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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 preferential tax rate on C Corporation Qualified Timber Gains under the Bipartisan Budget Act of 2018.

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

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing 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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