Certain Balance Sheet Components (Schedule of Timber and Timberlands) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Timber And Timberlands [Abstract]
Timber and timberlands	$ 570,341	$ 572,273
Logging roads	68,837	69,583
Total timber and timberlands, net	$ 639,178	$ 641,856

Amount before accumulated depreciation and depletion of forest crops and land devoted primarily to the growth and harvest of forest crops for commercial purposes.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Name:	us-gaap_TimberAndTimberlands
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant