Level 4 Segment Information (Details) (USD $)	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Sales
Trade	$ 744,878,000		$ 586,986,000
Intersegment	0		0
Total sales	744,878,000		586,986,000
Other Segment Information [Abstract]
Income (loss) before income taxes	19,729,000		1,729,000
Depreciation and amortization	8,477,000		8,119,000
EBITDA	33,000,000	[1]	14,600,000	[1]
Reconciliation from Segment Totals to Consolidated [Abstract]
Interest expense	(4,891,000)		(4,813,000)
Interest income	62,000		107,000
Income (loss) before income taxes	19,729,000		1,729,000
Operating Segments [Member]
Other Segment Information [Abstract]
Income (loss) before income taxes	24,600,000		6,400,000
Reconciliation from Segment Totals to Consolidated [Abstract]
Income (loss) before income taxes	24,600,000		6,400,000
Wood Products [Member]
Sales
Intersegment	105,500,000		75,600,000
Total sales	269,200,000		211,100,000
Other Segment Information [Abstract]
Income (loss) before income taxes	20,800,000		10,800,000
Depreciation and amortization	6,300,000		5,900,000
EBITDA	27,100,000	[1]	16,700,000	[1]
Reconciliation from Segment Totals to Consolidated [Abstract]
Income (loss) before income taxes	20,800,000		10,800,000
Building Materials Distribution [Member]
Sales
Trade	581,100,000		451,400,000
Intersegment	0		0
Total sales	581,100,000		451,400,000
Other Segment Information [Abstract]
Income (loss) before income taxes	8,000,000		(800,000)
Depreciation and amortization	2,200,000		2,200,000
EBITDA	10,200,000	[1]	1,400,000	[1]
Reconciliation from Segment Totals to Consolidated [Abstract]
Income (loss) before income taxes	8,000,000		(800,000)
Corporate and Other [Member]
Sales
Trade	0		0
Intersegment	0		0
Total sales	0		0
Other Segment Information [Abstract]
Income (loss) before income taxes	(4,200,000)		(3,600,000)
Depreciation and amortization	0		0
EBITDA	(4,200,000)	[1]	(3,500,000)	[1]
Reconciliation from Segment Totals to Consolidated [Abstract]
Income (loss) before income taxes	(4,200,000)		(3,600,000)
Intersegment eliminations [Member]
Sales
Intersegment	(105,500,000)		(75,600,000)
Total sales	$ (105,500,000)		$ (75,600,000)

[1] EBITDA is defined as income (loss) before interest (interest expense and interest income), income taxes, and depreciation and amortization. EBITDA is the primary measure used by our chief operating decision maker to evaluate segment operating performance and to decide how to allocate resources to segments. We believe EBITDA is useful to investors because it provides a means to evaluate the operating performance of our segments and our company on an ongoing basis using criteria that are used by our internal decision makers and because it is frequently used by investors and other interested parties when comparing companies in our industry that have different financing and capital structures and/or tax rates. We believe EBITDA is a meaningful measure because it presents a transparent view of our recurring operating performance and allows management to readily view operating trends, perform analytical comparisons, and identify strategies to improve operating performance. EBITDA, however, is not a measure of our liquidity or financial performance under generally accepted accounting principles (GAAP) and should not be considered as an alternative to net income (loss), income (loss) from operations, or any other performance measure derived in accordance with GAAP or as an alternative to cash flow from operating activities as a measure of our liquidity. The use of EBITDA instead of net income (loss) or segment income (loss) has limitations as an analytical tool, including the inability to determine profitability; the exclusion of interest expense, interest income, and associated significant cash requirements; and the exclusion of depreciation and amortization, which represent unavoidable operating costs. Management compensates for the limitations of EBITDA by relying on our GAAP results. Our measure of EBITDA is not necessarily comparable to other similarly titled captions of other companies due to potential inconsistencies in the methods of calculation.The following is a reconciliation of net income to EBITDA: Three Months EndedMarch 31 2013 2012 (millions)Net income(1) $80.8 $1.7Interest expense 4.9 4.8Interest income (0.1) (0.1)Income tax provision (benefit)(1) (61.1) 0.1Depreciation and amortization 8.5 8.1EBITDA $33.0 $14.6 _______________________________________ (1)First quarter 2013 includes $68.7 million of income tax benefit associated with the recording of net deferred tax assets upon our conversion to a corporation.