Certain Balance Sheet Components (Schedule of Other Long-term Assets) (Details) - USD ($) $ in Thousands		Sep. 30, 2018	Dec. 31, 2017
Other Assets Noncurrent [Abstract]
Mineral rights		$ 5,882
Credit facility issuance costs		2,551	$ 1,097
Interest rate swaps		3,392	1,156
Restricted cash	[1]	3,708
Investment in company owned life insurance (COLI)		2,741	1,996
Deferred real estate development costs		2,487	2,565
Other		2,935	1,457
Total other long-term assets		$ 23,696	$ 8,271

[1] Amounts included in restricted cash represent proceeds held by a qualified intermediary that are intended to be reinvested in timber and timberlands.