Summary of Principal Accounting Policies Summary of Principal Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2013 acre
Accounting Policies [Abstract]
Timber And Timberlands Acres Owned	1,400,000
Buildings and Structures Useful Life Minimum	30 years 0 months 0 days
Buildings and Structures Useful Life Maximum	40 years 0 months 0 days
Equipment Useful Life Minimum	2 years 0 months 0 days
Equipment Useful Life Maximum	25 years 0 months 0 days
Historic Average Annual Growth Rate for Merchantable Inventory Range, Minimum	2.00%
Historic Average Annual Growth Rate for Mechantable Inventory Range, Maximum	5.00%
Bridges, Culverts and Gravel Surfacing Useful Life Minimum	5 years 0 months 0 days
Bridges, Culverts and Gravel Surfacing Useful Life Maximum	20 years 0 months 0 days