Derivatives (Details)	12 Months Ended
	Dec. 31, 2017 USD ($) derivative_contract board_foot
Derivative [Line Items]
Restricted cash on deposit | $	$ 52,300
Net Long (Buying)
Derivative [Line Items]
Net Long Buying Position | board_foot	330,000
Number of lumber derivative contract | derivative_contract	3
Long
Derivative [Line Items]
Net Long Buying Position | board_foot	1,100,000
Number of lumber derivative contract | derivative_contract	10
Short
Derivative [Line Items]
Net Long Buying Position | board_foot	1,100,000
Number of lumber derivative contract | derivative_contract	10
Other Current Assets
Derivative [Line Items]
Fair value of lumber contracts | $	$ 3,900
Other Current Assets | Net Long (Buying)
Derivative [Line Items]
Fair value of lumber contracts | $	$ 5,200